TRIPLET-STATES OF AMMONIA EXCITED BY LOW-ENERGY ELECTRONS

被引：14

作者：

CVEJANOVIC, S ^{[1
]}

JURETA, J ^{[1
]}

MINIC, M ^{[1
]}

CVEJANOVIC, D ^{[1
]}

机构：

[1] UNIV BELGRADE, FAC PHYS, YU-11001 BELGRADE, YUGOSLAVIA

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 1992年 / 25卷 / 20期

关键词：

D O I：

10.1088/0953-4075/25/20/026

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A low-energy crossed-beam electron spectrometer is used to investigate excitation of ammonia. Spectra obtained at low residual energies and large scattering angles in both constant residual energy mode and energy loss mode show excitation of two triplet states of ammonia, labelled a and b. A triplet b state is observed for the first time in the present work, while for the a state several lower, previously unobserved vibrational levels are detected, The threshold electron spectrum obtained by detecting zero residual energy electrons reveals a strong influence of threshold resonance in the excitation of the lowest Rydberg a state. Also a very large threshold peak in the excitation of the upsilon = 1 level of the symmetric stretch mode (nu1) of the ground electronic state suggests a resonant process at very low energies.

引用

页码：4337 / 4349

页数：13

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