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A study of the reactive intermediate IF and I atoms with photoelectron spectroscopy

A study of the reactive intermediate IF and I atoms with photoelectron spectroscopy
A study of the reactive intermediate IF and I atoms with photoelectron spectroscopy
Angle-resolved photoelectron (PE) spectra were recorded for IF and I. These were prepared as primary and secondary products of the F + CH2I2 reaction. PE spectra were recorded with different IF-to-I ratios to evaluate the relative intensities of IF and I photoelectron bands where their bands were overlapped. Improved values were obtained for the vertical and adiabatic ionization energies of the IF+(X2?3/2) ? IF(X1?+) and IF+(2?1/2) ? IF(X1?+) ionizations and for the spectroscopic constants ?e and ?exe for the two IF ionic states X2?3/2 and 2?1/2. Equilibrium bond lengths re of these IF ionic states were derived from the experimental relative intensities of the vibrational components and calculated Franck?Condon factors. Threshold photoelectron (TPE) spectra were also recorded under the same reaction conditions. On comparing the TPE and PE spectra, the contributions from atomic iodine were much more intense in the TPE spectra. No difference was seen between the vibrational envelopes of the two observed IF bands, and no extra structure was seen associated with the TPE bands of IF as has been observed in TPE spectra of other diatomic halogens. The extra features that were observed in the TPE spectra can be assigned to contributions from autoionization of known I Rydberg states.
1089-5639
6939-6949
Innocenti, Fabrizio
2e95973e-c7b9-4166-8bf2-8b06a713fdfa
Eypper, Marie
de5d8ecd-5e65-4bc0-b3ce-91574700448d
Beccaceci, Sonya
379c1164-a987-4fc7-94ff-12646acdb02e
Morris, Alan
e70d7160-c9d9-4035-90b8-9006a1052551
Stranges, Stefano
6083b375-8a6f-4456-b6bc-54d18f19244c
West, John B.
6e19c4a5-ea05-44bc-9800-e4e299a42eb3
King, George C.
4dfa1a76-f28b-496e-b5d4-638b5e73569e
Dyke, John M.
46393b45-6694-46f3-af20-d7369d26199f
Innocenti, Fabrizio
2e95973e-c7b9-4166-8bf2-8b06a713fdfa
Eypper, Marie
de5d8ecd-5e65-4bc0-b3ce-91574700448d
Beccaceci, Sonya
379c1164-a987-4fc7-94ff-12646acdb02e
Morris, Alan
e70d7160-c9d9-4035-90b8-9006a1052551
Stranges, Stefano
6083b375-8a6f-4456-b6bc-54d18f19244c
West, John B.
6e19c4a5-ea05-44bc-9800-e4e299a42eb3
King, George C.
4dfa1a76-f28b-496e-b5d4-638b5e73569e
Dyke, John M.
46393b45-6694-46f3-af20-d7369d26199f

Innocenti, Fabrizio, Eypper, Marie, Beccaceci, Sonya, Morris, Alan, Stranges, Stefano, West, John B., King, George C. and Dyke, John M. (2008) A study of the reactive intermediate IF and I atoms with photoelectron spectroscopy. Journal of Physical Chemistry A, 112 (30), 6939-6949. (doi:10.1021/jp803141c).

Record type: Article

Abstract

Angle-resolved photoelectron (PE) spectra were recorded for IF and I. These were prepared as primary and secondary products of the F + CH2I2 reaction. PE spectra were recorded with different IF-to-I ratios to evaluate the relative intensities of IF and I photoelectron bands where their bands were overlapped. Improved values were obtained for the vertical and adiabatic ionization energies of the IF+(X2?3/2) ? IF(X1?+) and IF+(2?1/2) ? IF(X1?+) ionizations and for the spectroscopic constants ?e and ?exe for the two IF ionic states X2?3/2 and 2?1/2. Equilibrium bond lengths re of these IF ionic states were derived from the experimental relative intensities of the vibrational components and calculated Franck?Condon factors. Threshold photoelectron (TPE) spectra were also recorded under the same reaction conditions. On comparing the TPE and PE spectra, the contributions from atomic iodine were much more intense in the TPE spectra. No difference was seen between the vibrational envelopes of the two observed IF bands, and no extra structure was seen associated with the TPE bands of IF as has been observed in TPE spectra of other diatomic halogens. The extra features that were observed in the TPE spectra can be assigned to contributions from autoionization of known I Rydberg states.

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I+IFpaperJPhysChem(in_press).doc - Other
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Published date: 31 July 2008

Identifiers

Local EPrints ID: 147191
URI: http://eprints.soton.ac.uk/id/eprint/147191
ISSN: 1089-5639
PURE UUID: 4604fd58-67d5-4c4a-bb9b-cfcb007f9d9d
ORCID for John M. Dyke: ORCID iD orcid.org/0000-0002-9808-303X

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Date deposited: 23 Apr 2010 11:21
Last modified: 20 Jul 2019 01:27

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Contributors

Author: Fabrizio Innocenti
Author: Marie Eypper
Author: Sonya Beccaceci
Author: Alan Morris
Author: Stefano Stranges
Author: John B. West
Author: George C. King
Author: John M. Dyke ORCID iD

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