NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Relative quantum yield of I-asterisk(2P1/2) in the tunable laser UV photodissociation of i-C3F7I and n-C3F7I - Effect of temperature and exciplex emissionWavelength-specific relative quantum yields of metastable I from pulsed laser photodissociation of i-C3F7I and n-C3F7I in the range 265-336 nm are determined by measuring the time-resolved infrared emission from the atomic I(P-2(1/2) P-2(3/2) transition. It is shown that although this yield appears to be unity from 265 to 298 nm, it decreases dramatically at longer wavelengths. Values are also reported for the enhancement of emission from metastable I due to exciplex formation at several temperatures. The exciplex formation emission increases linearly with parent gas pressure, but decreases with increasing temperature. Absorption spectra of i- and n-C3F7I between 303 and 497 K are presented, and the effect of temperature on the quantum yields at selected wavelengths greater than 300 nm, where increasing the temperature enhances the absorption considerably, are given. The results are discussed in regard to the development of solar-pumped iodine lasers.
Document ID
19830066414
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Smedley, J. E. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Leone, S. R. (Joint Institute for Laboratory Astrophysics; National Bureau of Standards Boulder, CO, United States)
Date Acquired
August 11, 2013
Publication Date
September 15, 1983
Publication Information
Publication: Journal of Chemical Physics
Volume: 79
ISSN: 0021-9806
Subject Category
LASERS AND MASERS
Distribution Limits
Public
Copyright
Other