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The role of the intermediate state in angle-resolved photoelectron studies using (2 + 1) resonance-enhanced multiphoton ionization of the chiral terpenes, α-pinene and 3-carene

The role of the intermediate state in angle-resolved photoelectron studies using (2 + 1) resonance-enhanced multiphoton ionization of the chiral terpenes, α-pinene and 3-carene
The role of the intermediate state in angle-resolved photoelectron studies using (2 + 1) resonance-enhanced multiphoton ionization of the chiral terpenes, α-pinene and 3-carene

Photoelectron angular distributions (PADs), ranging up to the maximum 6th order Legendre polynomial term set by the Yang theorem, have been recorded for the (2 + 1) resonance enhanced multiphoton ionization (REMPI) of two terpene isomers, 3-carene and α-pinene, employing femtosecond lasers and electron velocity map imaging detection. PAD measurements made with coincident photoion detection allow ion fragmentation effects to be assessed. Using circular polarization and enantiomerically pure samples the PAD measurements are extended to include chiral (odd) Legendre polynomial terms, and these are analysed and discussed as multiphoton photoelectron circular dichroism (MP-PECD). Comparisons are also made with single photon (synchrotron radiation) PECD of these compounds. Although for a given compound a common final cation state is reached, pronounced differences are observed between PECD and MP-PECD, and between the alternative identified REMPI intermediate states in the case of MP-PECD.

angular distribution, Circular dichroism, photoelectron specroscopy, photoionization, terpenes
0026-8976
Ganjitabar, Hassan
f53eb1e6-598e-45cb-9874-931bdbf8dd63
Singh, Dhirendra P.
5bc075aa-e5b0-4364-a368-30a512e538c0
Chapman, Richard
8a9fe0e2-c408-4188-bf10-e93bf247205c
Gardner, Adrian
664a8caa-2fd8-42e7-ab0c-790cc894ad9f
Minns, Russell S.
85280db4-c5a6-4a4c-82fe-75693c6a6045
Powis, Ivan
93926861-3dc2-4fc8-b222-18093cd81369
Reid, Katharine L.
57bd29ff-77de-4069-af40-05b4b3329e21
Vredenborg, Arno
70b3a904-0435-402f-9fa0-0f1d0bb402bb
Ganjitabar, Hassan
f53eb1e6-598e-45cb-9874-931bdbf8dd63
Singh, Dhirendra P.
5bc075aa-e5b0-4364-a368-30a512e538c0
Chapman, Richard
8a9fe0e2-c408-4188-bf10-e93bf247205c
Gardner, Adrian
664a8caa-2fd8-42e7-ab0c-790cc894ad9f
Minns, Russell S.
85280db4-c5a6-4a4c-82fe-75693c6a6045
Powis, Ivan
93926861-3dc2-4fc8-b222-18093cd81369
Reid, Katharine L.
57bd29ff-77de-4069-af40-05b4b3329e21
Vredenborg, Arno
70b3a904-0435-402f-9fa0-0f1d0bb402bb

Ganjitabar, Hassan, Singh, Dhirendra P., Chapman, Richard, Gardner, Adrian, Minns, Russell S., Powis, Ivan, Reid, Katharine L. and Vredenborg, Arno (2020) The role of the intermediate state in angle-resolved photoelectron studies using (2 + 1) resonance-enhanced multiphoton ionization of the chiral terpenes, α-pinene and 3-carene. Molecular Physics, [e1808907]. (doi:10.1080/00268976.2020.1808907).

Record type: Article

Abstract

Photoelectron angular distributions (PADs), ranging up to the maximum 6th order Legendre polynomial term set by the Yang theorem, have been recorded for the (2 + 1) resonance enhanced multiphoton ionization (REMPI) of two terpene isomers, 3-carene and α-pinene, employing femtosecond lasers and electron velocity map imaging detection. PAD measurements made with coincident photoion detection allow ion fragmentation effects to be assessed. Using circular polarization and enantiomerically pure samples the PAD measurements are extended to include chiral (odd) Legendre polynomial terms, and these are analysed and discussed as multiphoton photoelectron circular dichroism (MP-PECD). Comparisons are also made with single photon (synchrotron radiation) PECD of these compounds. Although for a given compound a common final cation state is reached, pronounced differences are observed between PECD and MP-PECD, and between the alternative identified REMPI intermediate states in the case of MP-PECD.

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Accepted/In Press date: 3 August 2020
e-pub ahead of print date: 25 August 2020
Keywords: angular distribution, Circular dichroism, photoelectron specroscopy, photoionization, terpenes

Identifiers

Local EPrints ID: 443738
URI: http://eprints.soton.ac.uk/id/eprint/443738
ISSN: 0026-8976
PURE UUID: ca425cd8-a3ac-46b4-9c7b-b79ffb11a1a5
ORCID for Russell S. Minns: ORCID iD orcid.org/0000-0001-6775-2977

Catalogue record

Date deposited: 10 Sep 2020 16:46
Last modified: 07 Oct 2020 02:00

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Contributors

Author: Hassan Ganjitabar
Author: Dhirendra P. Singh
Author: Richard Chapman
Author: Adrian Gardner
Author: Ivan Powis
Author: Katharine L. Reid
Author: Arno Vredenborg

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