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

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6502825

Brenner, D M

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.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6502825
• Report Number(s): BNL-28757; CONF-810609-2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
CARBON DIOXIDE LASERS
CARBONIC ACID DERIVATIVES
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
GAS LASERS
INFRARED RADIATION
LASER RADIATION
LASERS
LUMINESCENCE
OPTICAL PUMPING
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOSGENE
PUMPING
RADIATIONS
VIBRATIONAL STATES