DISPERSED FLUORESCENCE-SPECTRUM OF NAAR - GROUND AND EXCITED-STATE POTENTIAL CURVES

被引:161
作者
TELLINGHUISEN, J
RAGONE, A
KIM, MS
AUERBACH, DJ
SMALLEY, RE
WHARTON, L
LEVY, DH
机构
[1] UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637
[2] UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637
关键词
D O I
10.1063/1.438428
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The van der Waals molecule NaAr has been prepared by supersonic free jet expansion of a mixture of sodium, argon, and helium. The A 2Π ←X 2∑+ electronic transition has been excited by a tunable dye laser and the resulting A→X fluorescence has been studied. The dispersed fluorescence spectra display both discrete and diffuse features, corresponding to transitions from excited vibrational levels of the A state to bound and unbound levels of the X state. The characteristic reflection structure in the bound-free spectra permits an unambiguous assignment of the vibrational numbering in the A state. This assignment and the previously measured spectroscopic constants are used to calculate the potential curve of the A state. The discrete structure in the fluorescence spectra is analyzed and, together with the previous measurements, is used to determine the potential curve of the X state in the well region. The repulsive part of the X curve is then deduced through trial-and-error simulation of the biund-free spectra. The potential curves derived in this work are compared critically with results of several previous experimental and theoretical studies of NaAr. © 1979 American Institute of Physics.
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页码:1283 / 1291
页数:9
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