IR multiphoton pumping of optically selected levels of the approx. A /sup 1/A/sub 2/ state of thiophosgene

Below approx. 3400 cm/sup -1/ of excess vibrational energy relative to the origin, the quantum yield of fluorescence is unity independent of vibronic level. Above approx. 3400 cm/sup -1/, the lifetime suddenly changes from 35.mu.s to < 100ns. The approx. A /sup 1/A/sub 2/ state absorbs IR photons...

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Bibliographic Details
Main Author: Brenner, D M
Language:unknown
Published: 2013
Subjects:
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
42 ENGINEERING
PHOSGENE
OPTICAL PUMPING
CARBON DIOXIDE LASERS
FLUORESCENCE
INFRARED RADIATION
LASER RADIATION
VIBRATIONAL STATES
CARBONIC ACID DERIVATIVES
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
GAS LASERS
LASERS
LUMINESCENCE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PUMPING
RADIATIONS
Carbonic acid
Online Access:http://www.osti.gov/servlets/purl/6502825
https://www.osti.gov/biblio/6502825
Description
Summary:Below approx. 3400 cm/sup -1/ of excess vibrational energy relative to the origin, the quantum yield of fluorescence is unity independent of vibronic level. Above approx. 3400 cm/sup -1/, the lifetime suddenly changes from 35.mu.s to < 100ns. The approx. A /sup 1/A/sub 2/ state absorbs IR photons, probably via the 2 .nu./sub 2/ mode, in the 10.6.mu. wavelength region of the CO/sub 2/ laser. There is no obvious dependence of the predissociation yield on the vibrational energy content of the initial state. At 2900 cm/sup -1/ where the density of states is approx. 1 cm/sup -1/, the predissociation yield is wavelength dependent and the oscillator strength is very low. With increasing vibrational energy of the initial state, the predissociation yield does not increase. There is no obvious dependence on fluence. The dependence on laser intensity is neither quartic nor linear.

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