The University of Southampton
University of Southampton Institutional Repository

Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy

Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy
Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy

The dissociation dynamics of CH3I is investigated on the red (269 nm) and blue (255 nm) side of the absorption maximum of the A-band. Using a multiphoton ionisation probe in a time-resolved photoelectron imaging experiment we observe very different dynamics at the two wavelengths, with significant differences in the measured lifetime and dynamic structure. The differences are explained in terms of changes in excitation cross-sections of the accessible 3Q0 and 1Q1 states and the subsequent dynamics upon each of them. The measurements support the existing literature on the rapid dissociation dynamics on the red side of the absorption maximum at 269 nm which is dominated by the dynamics along the 3Q0 state. At 255 nm we observe similar dynamics along the 3Q0 state but also a significant contribution from the 1Q1 state. The dynamics along the 1Q1 potential show a more complex structure in the photoelectron spectrum and a significantly increased lifetime, indicative of a more complex reaction pathway.

1463-9076
11142-11149
Warne, Emily M.
63799bdf-67fa-4dd8-adac-b963a9587a28
Downes-Ward, Briony
fa385501-e59a-4f84-b996-9bd924afe846
Woodhouse, Joanne
94d6c235-3e1e-44bc-8379-525862fd382c
Parkes, Michael A.
a53d8679-bd6a-442e-9370-f7dce3d449fc
Bellshaw, Darren
48dd9375-5b86-4d80-a00a-e5552cbd910c
Springate, Emma
f3004731-cf69-48bc-9816-1300a2276191
Majchrzak, Paulina
703902f3-2e66-41e6-bf89-5dea56ba2e08
Karras, Gabriel
fbb132bf-0e2a-4a12-9896-193e6eaef91f
Wyatt, Adam
e439e99f-0f0c-41d6-9db4-a5ed09c9cd4b
Kirrander, Adam
bf3ed07d-dbe0-4f83-bb97-a0f9c27363ca
Zhang, Yu
e47a1a80-1934-4180-8739-e03a0bbe23bd
Chapman, Richard
08941680-7e2c-4bf8-b499-b988e15ce933
Minns, Russell
85280db4-c5a6-4a4c-82fe-75693c6a6045
Warne, Emily M.
63799bdf-67fa-4dd8-adac-b963a9587a28
Downes-Ward, Briony
fa385501-e59a-4f84-b996-9bd924afe846
Woodhouse, Joanne
94d6c235-3e1e-44bc-8379-525862fd382c
Parkes, Michael A.
a53d8679-bd6a-442e-9370-f7dce3d449fc
Bellshaw, Darren
48dd9375-5b86-4d80-a00a-e5552cbd910c
Springate, Emma
f3004731-cf69-48bc-9816-1300a2276191
Majchrzak, Paulina
703902f3-2e66-41e6-bf89-5dea56ba2e08
Karras, Gabriel
fbb132bf-0e2a-4a12-9896-193e6eaef91f
Wyatt, Adam
e439e99f-0f0c-41d6-9db4-a5ed09c9cd4b
Kirrander, Adam
bf3ed07d-dbe0-4f83-bb97-a0f9c27363ca
Zhang, Yu
e47a1a80-1934-4180-8739-e03a0bbe23bd
Chapman, Richard
08941680-7e2c-4bf8-b499-b988e15ce933
Minns, Russell
85280db4-c5a6-4a4c-82fe-75693c6a6045

Warne, Emily M., Downes-Ward, Briony, Woodhouse, Joanne, Parkes, Michael A., Bellshaw, Darren, Springate, Emma, Majchrzak, Paulina, Karras, Gabriel, Wyatt, Adam, Kirrander, Adam, Zhang, Yu, Chapman, Richard and Minns, Russell (2019) Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy. Physical Chemistry Chemical Physics, 21 (21), 11142-11149. (doi:10.1039/C9CP01477B).

Record type: Article

Abstract

The dissociation dynamics of CH3I is investigated on the red (269 nm) and blue (255 nm) side of the absorption maximum of the A-band. Using a multiphoton ionisation probe in a time-resolved photoelectron imaging experiment we observe very different dynamics at the two wavelengths, with significant differences in the measured lifetime and dynamic structure. The differences are explained in terms of changes in excitation cross-sections of the accessible 3Q0 and 1Q1 states and the subsequent dynamics upon each of them. The measurements support the existing literature on the rapid dissociation dynamics on the red side of the absorption maximum at 269 nm which is dominated by the dynamics along the 3Q0 state. At 255 nm we observe similar dynamics along the 3Q0 state but also a significant contribution from the 1Q1 state. The dynamics along the 1Q1 potential show a more complex structure in the photoelectron spectrum and a significantly increased lifetime, indicative of a more complex reaction pathway.

Text
CH3I_MPI (6) - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 7 May 2019
e-pub ahead of print date: 10 May 2019
Published date: 2019

Identifiers

Local EPrints ID: 430765
URI: http://eprints.soton.ac.uk/id/eprint/430765
ISSN: 1463-9076
PURE UUID: 5d93f14d-0163-4cce-9d2b-60cf145a821b
ORCID for Joanne Woodhouse: ORCID iD orcid.org/0000-0002-0771-5362
ORCID for Russell Minns: ORCID iD orcid.org/0000-0001-6775-2977

Catalogue record

Date deposited: 10 May 2019 16:30
Last modified: 06 Jun 2024 04:05

Export record

Altmetrics

Contributors

Author: Emily M. Warne
Author: Briony Downes-Ward
Author: Joanne Woodhouse ORCID iD
Author: Michael A. Parkes
Author: Darren Bellshaw
Author: Emma Springate
Author: Paulina Majchrzak
Author: Gabriel Karras
Author: Adam Wyatt
Author: Adam Kirrander
Author: Yu Zhang
Author: Richard Chapman
Author: Russell Minns ORCID iD

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

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×