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Chandola S, Prabhakar P, Seth R, Jana M. Intramural Duodenal Hematoma in a Case of Hyper IgM Syndrome. J Pediatr Hematol Oncol 2024; 46:104-105. [PMID: 37867238 DOI: 10.1097/mph.0000000000002773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 09/17/2023] [Indexed: 10/24/2023]
Abstract
Three-year-old boy who presented with colicky abdominal pain, diarrhoea and vomiting was investigated with computed tomography which revealed a mass in the peripancreatic region. An imaging possibility of duodenal intramural hematoma was considered after reassessment with ultrasound which was subsequently confirmed by magnetic resonance imaging. The development of a spontaneous duodenal hematoma lead to further evaluation of the patient and revealed X linked hyper IgM syndrome.
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Affiliation(s)
- Stuti Chandola
- Department of Radiodiagnosis and Interventional Radiology
| | | | - Rachna Seth
- Department of Pediatric Oncology, AIIMS, New Delhi, India
| | - Manisha Jana
- Department of Radiodiagnosis and Interventional Radiology
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Gupta A, Bagri N, Chandola S, Jana M. Erratum for: Case 316: Progressive Pseudorheumatoid Dysplasia. Radiology 2024; 310:e249011. [PMID: 38530184 DOI: 10.1148/radiol.249011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
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3
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Chandola S, Dhamija E, Paul SB, Hari S, Batra A, Mathur S, Deo SVS. Imaging features of breast cancer subtypes on contrast enhanced ultrasound: a feasibility study. Ecancermedicalscience 2023; 17:1619. [PMID: 38414960 PMCID: PMC10898897 DOI: 10.3332/ecancer.2023.1619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Indexed: 02/29/2024] Open
Abstract
The objective of this research was to study the contrast enhancement patterns of the different molecular subtypes of breast cancer on contrast-enhanced ultrasound (CEUS) using both qualitative and quantitative parameters. This prospective study included females with a single breast mass which was histopathologically proven carcinoma. B mode ultrasound (USG) and CEUS were performed in all patients during baseline assessment. Qualitative CEUS assessment encompassed enhancement pattern, presence of fill-in and washout. Quantitative assessment included measurement of peak enhancement, time to peak; area under the curve and mean transit time. A p-value < 0.05 was considered statistically significant for differentiating the subtypes. The included thirty masses were categorised into two subtypes-triple negative breast cancer (TNBC) (36.7%) and non-TNBC (63.3%) subtypes. With B-mode USG, a statistically significant difference was observed between the two groups with respect to their shape and margins. TNBC lesions showed an oval shape, circumscribed margins and peripheral nodular enhancement on CEUS with the absence of fill-in even in the delayed phase (p-value - 0.04). The two subtypes did not significantly differ in terms of quantitative perfusion parameters. The various subtypes of breast cancer therefore possess distinct contrast enhancement patterns. CEUS potentially allows differentiation amongst these molecular subtypes that may aid in radiology-pathology (rad-path) correlation and follow up of the patients.
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Affiliation(s)
- Stuti Chandola
- Department of Radiodiagnosis and Interventional Radiology, IRCH, AIIMS, New Delhi 110029, India
| | - Ekta Dhamija
- Department of Radiodiagnosis and Interventional Radiology, IRCH, AIIMS, New Delhi 110029, India
| | - Shashi B Paul
- Department of Radiodiagnosis and Interventional Radiology, IRCH, AIIMS, New Delhi 110029, India
| | - Smriti Hari
- Department of Radiodiagnosis and Interventional Radiology, IRCH, AIIMS, New Delhi 110029, India
| | - Atul Batra
- Department of Medical Oncology, IRCH, AIIMS, New Delhi 110029, India
| | - Sandeep Mathur
- Department of Pathology, IRCH, AIIMS, New Delhi 110029, India
| | - S V S Deo
- Department of Surgical Oncology, IRCH, AIIMS, New Delhi 110029, India
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Gupta A, Bagri N, Chandola S, Jana M. Case 316: Progressive Pseudorheumatoid Dysplasia. Radiology 2023; 308:e220630. [PMID: 37642564 DOI: 10.1148/radiol.220630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
HISTORY A 10-year-old North Indian boy presented with swelling of multiple joints in his hands for the past 3 years. This swelling involved the small joints of his hands and some restriction of joint movement, without any associated tenderness or morning stiffness. No other joints were symptomatically involved. Prior to visiting our hospital, he had received disease-modifying antirheumatoid drugs for suspected juvenile idiopathic arthritis, without any clinical benefit. On examination, the metacarpophalangeal and interphalangeal joints were nontender but had swelling and flexion deformities. He also had a short stature (below the third centile) for his age. Inflammatory markers, including erythrocyte sedimentation rate (7 mm per hour; normal range, 0-22 mm per hour) and C-reactive protein level (1.5 mg/L; normal level, <10 mg/L), were normal, and the rheumatoid factor test result was negative. A skeletal survey of the patient was performed.
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Affiliation(s)
- Amit Gupta
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
| | - Narendra Bagri
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
| | - Stuti Chandola
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
| | - Manisha Jana
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
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Chandola S, Jana M. Bone in the Brain: Unusual Cause of Intracranial Ossification. Neurol India 2023; 71:847-848. [PMID: 37635553 DOI: 10.4103/0028-3886.383818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Affiliation(s)
- Stuti Chandola
- Department of Radiodiagnosis and Interventional Radiology, AIIMS, New Delhi, India
| | - Manisha Jana
- Department of Radiodiagnosis and Interventional Radiology, AIIMS, New Delhi, India
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Gupta A, Bagri N, Chandola S, Jana M. Case 316. Radiology 2023; 307:e220629. [PMID: 36972182 DOI: 10.1148/radiol.220629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
HISTORY A 10-year-old North Indian boy presented with swelling of multiple joints in his hands for the past 3 years. This swelling involved the small joints of his hands and some restriction of joint movement, without any associated tenderness or morning stiffness. No other joints were symptomatically involved. Prior to visiting our hospital, he had received disease-modifying antirheumatoid drugs for suspected juvenile idiopathic arthritis, without any clinical benefit. On examination, the metacarpophalangeal and interphalangeal joints were nontender but had swelling and flexion deformities. He also had a short stature (below the third centile) for his age. Inflammatory markers, including erythrocyte sedimentation rate (7 mm per hour; normal range, 0-22 mm per hour) and C-reactive protein level (1.5 mg/L; normal level, <10 mg/L), were normal, and the rheumatoid factor test result was negative. A skeletal survey of the patient was performed and is shown in Figures 1-6.
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Affiliation(s)
- Amit Gupta
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
| | - Narendra Bagri
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
| | - Stuti Chandola
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
| | - Manisha Jana
- From the Department of Radiodiagnosis and Interventional Radiology (A.G., S.C., M.J.) and Department of Pediatrics (N.B.), All India Institute of Medical Sciences, New Delhi 110029, India
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Chandola S, Dhamija E, Rastogi S, Jain D. Significance of Clinico-radiological Correlation in a Patient with Pulmonary Intimal Sarcoma Simulating as Pulmonary Thromboembolism. Mol Imaging Radionucl Ther 2023; 32:80-82. [PMID: 36820487 PMCID: PMC9950672 DOI: 10.4274/mirt.galenos.2022.93446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
Pulmonary intimal sarcoma (PAS) is a highly aggressive malignant mesenchymal tumor affecting the central pulmonary arteries. Similar clinical presentation and indeterminate laboratory parameters often result in misdiagnosis of this condition as pulmonary thromboembolism, which is a relatively common disease. Certain imaging features can however allow differentiation between these two diagnoses. We present one such case of PAS that was initially treated as pulmonary embolism; and briefly review the relevant imaging characteristics to avoid overlooking PAS especially in patients with an atypical clinical history for thromboembolism.
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Affiliation(s)
- Stuti Chandola
- All India Institute of Medical Sciences, Department of Radiodiagnosis, New Delhi, India
| | - Ekta Dhamija
- All India Institute of Medical Sciences, Department of Radiodiagnosis, New Delhi, India,* Address for Correspondence: All India Institute of Medical Sciences, Department of Radiodiagnosis, New Delhi, India Phone: +9999725388 E-mail:
| | - Sameer Rastogi
- All India Institute of Medical Sciences, Department of Medical Oncology, New Delhi, India
| | - Deepali Jain
- All India Institute of Medical Sciences, Department of Pathology, New Delhi, India
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Chandola S, Jana M, Naranje P, Bhalla AS. M-Mode Ultrasound as a Portable Alternative to Fluoroscopy in Evaluation of Diaphragmatic Motion: Technical Note. Indian J Radiol Imaging 2022; 33:232-234. [PMID: 37126468 PMCID: PMC10132867 DOI: 10.1055/s-0042-1758200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
AbstractDiaphragmatic structure and function assessment can be performed using grayscale as well as M-mode ultrasound. This article discusses the application of M-mode ultrasound in the assessment of diaphragmatic dysfunction.
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Affiliation(s)
- Stuti Chandola
- Department of Radiodiagnosis and Interventional Radiology, All Indian Institute of Medical Sciences, New Delhi, India
| | - Manisha Jana
- Department of Radiodiagnosis and Interventional Radiology, All Indian Institute of Medical Sciences, New Delhi, India
| | - Priyanka Naranje
- Department of Radiodiagnosis and Interventional Radiology, All Indian Institute of Medical Sciences, New Delhi, India
| | - Ashu Seith Bhalla
- Department of Radiodiagnosis and Interventional Radiology, All Indian Institute of Medical Sciences, New Delhi, India
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Ravisandhiran B, Chandola S, Bhalla D, Bajpai M, Kandasamy D, Jana M. Transperineal Ultrasound as an Adjunctive Modality in the Evaluation of 'H or N' Type of Recto-urethral Fistula: Technical Note. Indian J Radiol Imaging 2022; 33:110-112. [PMID: 36855728 PMCID: PMC9968547 DOI: 10.1055/s-0042-1759640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Anorectal malformations (ARMs) encompass a complex spectrum of congenital anomalies and H/N type anorectal malformations are extremely rare. In the presence of colostomy, an augmented pressure colostogram with or without retrograde or micturating cystourethrogram is the investigation of choice. Transperineal ultrasound is an imaging technique that allows a fairly accurate morphological assessment of ARMs along with dynamic evaluation of the anorectal structures and pelvic floor anatomy. Here we describe the role of transperineal ultrasound as an adjunctive modality in diagnosis of one such complex anomaly.
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Affiliation(s)
- Bharathi Ravisandhiran
- Department of Radiodiagnosis and Interventional Radiology, All India Institute of Medical Sciences, New Delhi, India
| | - Stuti Chandola
- Department of Radiodiagnosis and Interventional Radiology, All India Institute of Medical Sciences, New Delhi, India
| | - Deeksha Bhalla
- Department of Radiodiagnosis and Interventional Radiology, All India Institute of Medical Sciences, New Delhi, India
| | - Minu Bajpai
- Department of Paediatric Surgery, All India Institute of Medical Sciences, New Delhi, India
| | - Devasenathipathy Kandasamy
- Department of Radiodiagnosis and Interventional Radiology, All India Institute of Medical Sciences, New Delhi, India
| | - Manisha Jana
- Department of Radiodiagnosis and Interventional Radiology, All India Institute of Medical Sciences, New Delhi, India,Address for correspondence Manisha Jana, MD, DNB, FRCR Department of Radiodiagnosis and Interventional Radiology, All India Institute of Medical SciencesAnsari Nagar, New Delhi 110029India
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Swarup MS, Chandola S, Batra R, Prakash A, Garg A. Radiological approach to non-compressive myelopathies. Egypt J Radiol Nucl Med 2022. [DOI: 10.1186/s43055-022-00736-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Myelopathy, a pathological condition related to the spinal cord can broadly be categorized into compressive and non-compressive aetiologies. Magnetic resonance imaging remains the modality of choice when suspecting non-compressive myelopathy as it helps to localize the affected segment and exclude compression as the cause of myelopathy. This review deals with the imaging approach for non-compressive myelopathies.
Main body
Demyelinating disorders are the most common cause of non-compressive myelopathy and often show confounding features. Other causes include inflammatory, ischemic, metabolic, and neoplastic disorders. Non-compressive myelopathy can broadly be classified into acute and non-acute onset which can further be categorized according to the distribution of the signal abnormalities, including length of cord involvement, specific tract involvement, enhancement pattern, and the region of the spinal cord that is affected.
Conclusions
Imaging plays a critical role in the evaluation of clinically suspected cases of myelopathy and MR imaging (with or without contrast) remains the preferred modality. Compressive causes must be excluded as a cause of myelopathy. Despite a multitude of causes, the most common imaging appearance is a nonspecific T2 hyperintense signal in the spinal cord, and thus, a pragmatic diagnostic approach along with appropriate clinical and biochemical correlation is essential for arriving at an accurate diagnosis.
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Chandola S, Garg A. Scar endometriosis: Looking beyond the diagnosis - A case series. SA J Radiol 2022. [DOI: 10.4102/sajr.v26i1.2493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Scar endometriosis usually affects the abdominal wall or the perineum. Virtually all cases are linked with some form of surgical manipulation. Although the clinical diagnosis of scar endometriosis may be straightforward with classical symptomology, imaging with ultrasound and MRI are important for the determination of its extent, which is imperative for adequate preoperative planning. In addition, assessment of perineal scar endometriosis also requires the identification of anal sphincter complex involvement, which can significantly impact the surgical approach. Radiology plays a vital role in its diagnosis in atypical clinical scenarios.Contribution: This series of four cases describes the morphology and highlights the importance of imaging in the surgical management of scar endometriosis; three with abdominal wall involvement and one with the involvement of perineum.
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Denk M, Speiser E, Plaickner J, Chandola S, Sanna S, Zeppenfeld P, Esser N. Surface Resonant Raman Scattering from Cu(110). Phys Rev Lett 2022; 128:216101. [PMID: 35687453 DOI: 10.1103/physrevlett.128.216101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 11/17/2021] [Accepted: 04/03/2022] [Indexed: 06/15/2023]
Abstract
We report the first evidence of Raman scattering from surface phonons of a pristine metal surface. Our study reveals a Raman-active surface vibrational resonance on Cu(110) with a surprisingly large scattering efficiency. With the incident photon energy close to the energy of the Cu(110) surface state electronic transition, the Raman scattering from the surface optical resonance can be significantly enhanced, while any contribution from bulk phonons is absent.
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Affiliation(s)
- M Denk
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., Schwarzschildstrasse 8, 12489 Berlin, Germany
- Institute of Experimental Physics, Johannes Kepler University, Linz, Altenberger Strasse 69, 4040 Linz, Austria
| | - E Speiser
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., Schwarzschildstrasse 8, 12489 Berlin, Germany
| | - J Plaickner
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., Schwarzschildstrasse 8, 12489 Berlin, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - S Chandola
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., Schwarzschildstrasse 8, 12489 Berlin, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - S Sanna
- Institut für Theoretische Physik and Center for Materials Research (LaMa), Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen, Germany
| | - P Zeppenfeld
- Institute of Experimental Physics, Johannes Kepler University, Linz, Altenberger Strasse 69, 4040 Linz, Austria
| | - N Esser
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., Schwarzschildstrasse 8, 12489 Berlin, Germany
- Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany
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Chandola S, Sarthak Swarup M, Batra R, Manchanda A. Spinal Chloroma – Herald of blast crisis in a patient with chronic myeloid leukaemia: A case report. SA J Radiol 2022; 26:2286. [PMID: 35169501 PMCID: PMC8832072 DOI: 10.4102/sajr.v26i1.2286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 10/10/2021] [Indexed: 11/04/2022] Open
Abstract
Myeloid sarcoma or chloroma is a localised tumour characterised by extramedullary proliferation of precursor myeloid cells. Commonly occurring in association with acute myeloid leukaemia, chloroma can occasionally be seen in myeloproliferative disorders with subsequent blastic transformation. Imaging plays an important role in the diagnosis and evaluation of this entity. A case of chloroma involving the dorso-lumbar vertebral region is presented in a patient with chronic myeloid leukaemia with subsequent blastic transformation.
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Affiliation(s)
- Stuti Chandola
- Department of Radiodiagnosis, Maulana Azad Medical College, New Delhi, India
| | - M. Sarthak Swarup
- Department of Radiodiagnosis, Maulana Azad Medical College, New Delhi, India
| | - Radhika Batra
- Department of Radiodiagnosis, Maulana Azad Medical College, New Delhi, India
| | - Alpana Manchanda
- Department of Radiodiagnosis, Maulana Azad Medical College, New Delhi, India
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Hogan C, Speiser E, Chandola S, Suchkova S, Aulbach J, Schäfer J, Meyer S, Claessen R, Esser N. Controlling the Local Electronic Properties of Si(553)-Au through Hydrogen Doping. Phys Rev Lett 2018; 120:166801. [PMID: 29756924 DOI: 10.1103/physrevlett.120.166801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 11/12/2017] [Indexed: 06/08/2023]
Abstract
We propose a quantitative and reversible method for tuning the charge localization of Au-stabilized stepped Si surfaces by site-specific hydrogenation. This is demonstrated for Si(553)-Au as a model system by combining density functional theory simulations and reflectance anisotropy spectroscopy experiments. We find that controlled H passivation is a two-step process: step-edge adsorption drives excess charge into the conducting metal chain "reservoir" and renders it insulating, while surplus H recovers metallic behavior. Our approach illustrates a route towards microscopic manipulation of the local surface charge distribution and establishes a reversible switch of site-specific chemical reactivity and magnetic properties on vicinal surfaces.
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Affiliation(s)
- C Hogan
- Istituto di Struttura della Materia-CNR (ISM-CNR), via Fosso del Cavaliere 100, 00133 Rome, Italy
- Dipartimento di Fisica, Università di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy
| | - E Speiser
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Schwarzschildstraße 8, 12489 Berlin, Germany
| | - S Chandola
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Schwarzschildstraße 8, 12489 Berlin, Germany
| | - S Suchkova
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Schwarzschildstraße 8, 12489 Berlin, Germany
| | - J Aulbach
- Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - J Schäfer
- Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - S Meyer
- Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - R Claessen
- Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - N Esser
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Schwarzschildstraße 8, 12489 Berlin, Germany
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Chandola S, Hinrichs K, Gensch M, Esser N, Wippermann S, Schmidt WG, Bechstedt F, Fleischer K, McGilp JF. Structure of si(111)-in nanowires determined from the midinfrared optical response. Phys Rev Lett 2009; 102:226805. [PMID: 19658889 DOI: 10.1103/physrevlett.102.226805] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2009] [Indexed: 05/28/2023]
Abstract
The anisotropic optical response of Si(111)-(4x1)/(8x2)-In in the midinfrared, where ab initio studies predict significant changes in the band structure between competing models of this important quasi-1D system, has been measured using infrared spectroscopic ellipsometry (IRSE) and reflection anisotropy spectroscopy (RAS). Both IRSE and RAS of the (8x2) phase show that the anisotropic Drude tail of the (4x1) phase is replaced by two peaks at 0.50 and 0.72 eV, which appear in ab initio optical response calculations for the hexagon model of the (8x2) structure, but not the trimer model.
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Affiliation(s)
- S Chandola
- ISAS-Institute for Analytical Sciences, Department Berlin, Albert-Einstein Str. 9, 12489 Berlin, Germany
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McGilp JF, Power JR, O'Mahony JD, Chandola S. Resonant optical second harmonic generation from vicinal Si(001)Sb, and its microscopic origin. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/pssa.2211520123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Power JR, O'Mahony JD, Chandola S, McGilp JF. Resonant optical second harmonic generation at the steps of vicinal Si(001). Phys Rev Lett 1995; 75:1138-1141. [PMID: 10060215 DOI: 10.1103/physrevlett.75.1138] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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