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

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23 Scopus citations


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
Issue number12
StatePublished - Feb 22 1997

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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