Quantum Model of Dephasing-Enhanced Laser Desorption: Master Equation Approach.

reportActive / Technical Report | Accession Number: ADA153769 | Open PDF

Abstract:

A new model for laser-induced desorption is proposed based on a master equation for the photon population in a closely-couple subsystem involving the relevant degrees of freedom. The validity of approximations such as the Born and Markovian approximations is discussed in terms of the laser pulse duration and multiple time scales of the adspecies-surface system. The desorption rate is numerically calculated from the photon population and the threshold number of photons absorbed by the adspecies. The effects of anharmonicity, dephasing and laser detuning on the desorption rate are examined. The mechanism of dephasing and the possible direct and indirect desorption channels are discussed.

Author(s):
Lin, J. T. ; Huang, X. Y. ; George, T. F.
Author Organization(s):
ROCHESTER UNIV NY DEPT OF CHEMISTRY
Descriptive Note:
Interim technical rept.,
Supplementary Note:
DOI: 10.21236/ADA153769
Pagination:
0024

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
UROCHESTER/DC/85/TR-61, AFOSR-TR-85-1214
Contract/Grant Number(s):
N00014-80-C-0472, AFOSR-82-0046
Monitor Series:
TR-85-1214
 Subject Terms
Joint Capability Areas:
JCA_1.2.3_Educating; JCA_4.6_Engineering; JCA_1.3.2_Personnel Management; JCA_5_Command and Control
Modernization Areas:
Directed Energy
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*QUANTUM THEORY, *PULSED LASERS, THRESHOLD EFFECTS, DEGREES OF FREEDOM, APPROXIMATION(MATHEMATICS), PHOTONS, DESORPTION, CHANNELS, MARKOV PROCESSES
Field(s)/Group(s):
Lasers and Masers
Keyword(s):
Laser desorption, PE61153N, WUNR056749
Report Date:
1985 Apr 01