Rotational analysis and assignment of the green band system of FeH to the e 6II-a 6Δ; transition

Damian M. Goodridge, Robert T. Carter, John M. Brown, Timothy Steimle

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The technique of laser excitation spectroscopy at Doppler resolution has been used to record bands in the electronic spectrum of FeH around 532 nm. A number of lines were also recorded at sub-Doppler resolution using intermodulated fluorescence spectroscopy. Dispersed fluorescence studies were used extensively to aid the assignment of a total of 153 lines in this region of the spectrum to either the (0,0) or the (0,1) band of the e 6II-a 6Δ; transition. All the assignments from the excitation spectrum obey the selection rule ΔΩ=-1, giving subbands which involve the lowest three spin components in each state; transitions with ΔΩ=0 were seen only in dispersed fluorescence. Term values have been determined for the three components in both the ground vibrational level of the e 6II electronic state and the first excited vibrational level of the a 6Δ electronic state (those for the υ=0 level of the a 6Δ state have been determined previously). This study provides the first characterization of the spin components and the rotational levels of the e 6II state of FeH. This state is heavily perturbed and exhibits pronounced lambda-type doubling, making it very difficult to model the energy levels using an effective Hamiltonian approach.

Original languageEnglish (US)
Pages (from-to)4823-4831
Number of pages9
JournalJournal of Chemical Physics
Volume106
Issue number12
DOIs
StatePublished - Feb 22 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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