High-resolution studies of extreme-ultraviolet emission from CO by electron impact

被引:15
作者
Ciocca, M
Kanik, I
Ajello, JM
机构
[1] Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
关键词
D O I
10.1103/PhysRevA.55.3547
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report a high-resolution study (0.0036 nm full width at half maximum) of electron-impact-induced emission spectra of CO at 30-, 75-, and 100-eV electron-impact energies. The spectral features were acquired in optically thin conditions. At the specified resolution, attainable with our 3-m vacuum ultraviolet spectrometer, we observe rotationally resolved emission bands of CO in the extreme ultraviolet, from the vibronic states B-1 Sigma(+)(0), C-1 Sigma(+)(0), acid E-1 Pi(0), to the ground state X-1 Sigma(+)(0). A simple model of these bands, based on the Honl-London factors and the rotational constants, is constructed and is shown to be in good agreement with the observed spectra. The predissociation yield for the E-1 Pi electronic state has been determined, showing that the E state has the largest predissociation cross section of CO for all singlet-state Rydberg series members. The excitation function of the [E-1 Pi(0)-->X-1 Sigma(+)(0)] transition, in the 0-800-eV impact energy range, is measured, permitting determination of the oscillator strength by using a modified Born approximation analytical fit.
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页码:3547 / 3556
页数:10
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