Abstract
Fourier transform spectroscopy (FTS) was initially used mainly in infrared studies but has now been extended well into the visible and ultraviolet regions, where many advantages are found over classical grating spectroscopy. However, relatively stable sources are required for recording emission spectra. Microwave, radio frequency, and dc discharges through various gases can produce optical emissions from excited radicals, but these often have fairly complicated spectra. Simpler spectra can be obtained by combining FTS with other techniques. Laser excited fluorescence can be used with FTS in some cases and has been applied successfully to the transitions and , of NCO. Cooled emissions, emitted from discharges through supersonic jets, are useful for simplifying dense spectra and were essential for the rotational analyses of both the b4Σ– → a4IIi transition and the 5g → 4f Rydberg–Rydberg transition of NO. Chemiluminescence experiments using electronic energy transfer from metastable oxygen (a1Δg) can produce very clean emission spectra from molecules with low-lying electronic states. Similarly, metastable He atoms can be used to generate excited molecular ions by Penning ionization; for example, and H2O+ formed in this way show intense electronic emission spectra with Trot ≈ 300 K.
© 1989 Optical Society of America
PDF ArticleMore Like This
M. Vervloet
WB4 High Resolution Fourier Transform Spectroscopy (FTS) 1989
Mark C. Abrams, Sumner P. Davis, and James W. Brault
WI3 OSA Annual Meeting (FIO) 1989
Jørgen Bendtsen
TuA1 High Resolution Fourier Transform Spectroscopy (FTS) 1989