Gas phase electron resonance studies of non linear free radicals
Gas phase electron resonance studies of non linear free radicals
This thesis describes the investigation of the gas phase electron resonance spectra of the two isotopic open shell species HCO and DCO. The weak F = 3 ← 2, ΔJ = 5/2 component of the 211 - 212 K - doubling transition in HCO has been measured. This transition provides an accurate determination of the Fermi contact parameter. It has been analysed with previously measured frequencies, components of the N = 1, 2, 3, Ka = 1 K - doubling transitions and components of the 1ol ← 000 transition, to give an improved set of molecular parameters for HCO. The hyperfine parameters obtained are compared with those from solid state work. A centrifugal distortion parameter obtained is compared with the result from an an harmonic force field calculation. Tunable but weak high field components of transitions have been observed for both HCO and DCO. These are ΔN = 0 transitions and mostly either J = N + 1/2 , MJ = - (N - 1/2) ← - (N + 1/2) or J = (N + 1/2) ← (N - 1/2) , MJ = (N + 1/2) ← - (N - 1/2). Analysis of these, transition flux densities yielded values for the spin rotation parameters ϵaa and parameters ηaaaa which are related to the effect of centrifugal distortion on ϵaa. Measurements were made up to Ka = 4 and results found to fit the model ϵaa(K) = ϵaa + k2 ηaaaa. Values for the g tensor anisotropy were also obtained and the validity of Curl's relationship in the gas phase discussed in view of these results and those obtained for NO2 and C102 by other workers. The possibility of detecting other non linear species through observation of high field transitions of this type is considered.
University of Southampton
1976
Morley, Barbara Jane
(1976)
Gas phase electron resonance studies of non linear free radicals.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This thesis describes the investigation of the gas phase electron resonance spectra of the two isotopic open shell species HCO and DCO. The weak F = 3 ← 2, ΔJ = 5/2 component of the 211 - 212 K - doubling transition in HCO has been measured. This transition provides an accurate determination of the Fermi contact parameter. It has been analysed with previously measured frequencies, components of the N = 1, 2, 3, Ka = 1 K - doubling transitions and components of the 1ol ← 000 transition, to give an improved set of molecular parameters for HCO. The hyperfine parameters obtained are compared with those from solid state work. A centrifugal distortion parameter obtained is compared with the result from an an harmonic force field calculation. Tunable but weak high field components of transitions have been observed for both HCO and DCO. These are ΔN = 0 transitions and mostly either J = N + 1/2 , MJ = - (N - 1/2) ← - (N + 1/2) or J = (N + 1/2) ← (N - 1/2) , MJ = (N + 1/2) ← - (N - 1/2). Analysis of these, transition flux densities yielded values for the spin rotation parameters ϵaa and parameters ηaaaa which are related to the effect of centrifugal distortion on ϵaa. Measurements were made up to Ka = 4 and results found to fit the model ϵaa(K) = ϵaa + k2 ηaaaa. Values for the g tensor anisotropy were also obtained and the validity of Curl's relationship in the gas phase discussed in view of these results and those obtained for NO2 and C102 by other workers. The possibility of detecting other non linear species through observation of high field transitions of this type is considered.
This record has no associated files available for download.
More information
Published date: 1976
Identifiers
Local EPrints ID: 458295
URI: http://eprints.soton.ac.uk/id/eprint/458295
PURE UUID: 724f77df-3ffe-4dc2-8d25-d3d2581e3b51
Catalogue record
Date deposited: 04 Jul 2022 16:46
Last modified: 04 Jul 2022 16:46
Export record
Contributors
Author:
Barbara Jane Morley
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics