Blocked impurity band detectors applied to tunable diode laser spectroscopy in the 8- to 28-microm range

Absolute band intensities in the nu19/nu23 (530 cm(-1)) and nu7 (777 cm(-1)) bands of acetone ((CH3)2CO) from 232 to 295 K

Absolute band intensities of acetone ((CH3)2CO) in the nu19/nu23 and nu7 band systems near 530 and 777 cm(-1), respectively, were measured at temperatures of 232, 262 and 295 K, using a Fourier transform infrared (FTIR) spectrometer. No evident temperature dependence for the band intensities was observed. The dipole moments and the fundamental band intensities were derived in the harmonic oscillator approximation. The results are useful for the spectroscopic retrieval of acetone concentrations in the upper atmosphere.

High-resolution oxygen absorption spectrum obtained with an external-cavity continuously tunable diode laser

We have measured the electronic absorption spectrum of the oxygen (O(2)) A band b(1)Sigma(+)(g)(nu' =0)? X(3)Sigma(-)(g)(nu'' = 0) near 760 nm in room air by using a newly available external-cavity diode laser. The external-cavity diode laser permitted a continuous, single-mode scan of the P branch of ambient oxygen by 2f modulation spectroscopy. The external-cavity diode laser opens up many applications limited in the past by the noncontinuous tunability of standard monolithic Fabry-Perot cavity laser designs. Specifically, absorption transitions that coincide with he gain bandwidth of any available diode laser (635 to 1550 mn) may now be reached without the problems and imitations imposed by mode hops inherent in standard Fabry-Perot cavity designs.