Visible Wavelength Chemiluminescence Initiated by CO2 Laser Radiation.
CORNELL UNIV ITHACA N Y DEPT OF CHEMISTRY
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Visible chemiluminescence is emitted when gaseous mixtures of encapsulated metals SiH4, GeC2H54, SnCH34, PbCH34, BiCH33, SF6, and various oxidizers N2O, NO2, NF3 are subjected to a 20J pulse fwhm approx. 1 microsecond of CO2 10.6 micrometer laser radiation. The wavelength dependence of these emissions was recorded photographically with a 1m JA spectrograph. The various band systems for the excited diatoms were identified for example, S2, MF, MO. The temporal emission sequence was recorded with a four-channel, wide-band photometer, and a 14-channel narrow-band spectrophotometer band pass approximately 70 A. The magnitude of luminosity was measured as a function of the total pressure and the composition of the mixtures. For several combinations relatively narrow spikes fwhm approx. 10 microseconds were observed. For CuF the copper was inserted in the form of a salt or a metal foil very large vibrational temperatures in the upper electronic states were deduced. These features, and the appearance of some bands with high vibrational quantum numbers in the ground electronic state, suggest that inversions may have been produced by this technique. Author
- Lasers and Masers
- Atomic and Molecular Physics and Spectroscopy