Infared Stimulated Emission of N2O Trapped in Argon Matrices: Comparison with O3 and CO2
N2O molecules dispersed in argon matrices, at a concentration of 1/2000, are excited to their v 3 = 1 vibrational level by a laser pulse at 2218 cm-1. Stimulated emission of the ν3−ν1 transition is observed when the inversion population is large enough, i.e., when the energy absorbed from the laser...
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Published in | The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 104; no. 8; pp. 1670 - 1673 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
02.03.2000
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Online Access | Get full text |
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Summary: | N2O molecules dispersed in argon matrices, at a concentration of 1/2000, are excited to their v 3 = 1 vibrational level by a laser pulse at 2218 cm-1. Stimulated emission of the ν3−ν1 transition is observed when the inversion population is large enough, i.e., when the energy absorbed from the laser pulse exceeds a threshold value. From the measured energy threshold, we derive a “loss coefficient” for the cavity-like polycrystalline excited argon sample (a disk about 200 μm thick and 1.5 mm in diameter). Using this loss coefficient, on the basis of molecular spectroscopic parameters, we predict the inversion population threshold for stimulated emission on other N2O transitions, and for other molecules in identical matrices. The prediction is remarkably consistent with our previous observations on O3 and 13CO2 for which the emitting level (v 3 = 2 and v 2 = 3 or 2, respectively) is populated via intramolecular nonradiative transfers. |
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Bibliography: | istex:C2EC5B47C8BF45C172EAF8FA2747D16995CB7320 ark:/67375/TPS-H9M3CDQS-V |
ISSN: | 1089-5639 1520-5215 |
DOI: | 10.1021/jp9936749 |