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Synchrotron radiation studies of gas phase molecules; from hydrogen to DNA sugars

Vall-llosera, Gemma LU (2008)
Abstract
This thesis summarises experimental results on the molecular spectroscopy

of gas phase molecules excited by synchrotron radiation in the VUV and soft

X-ray regions. We have used three different detection techniques, photon in-

duced fluorescence spectroscopy, photoionisation mass spectroscopy and near

edge X-ray absorption fine structure spectroscopy to study molecular deu-

terium, hydrogen sulphide, ammonia, methanol, pyridine, pyridazine, pyrim-

idine, pyrazine, s-triazine, and 2-deoxy-D-ribose, the last one also known as

the DNA sugar. Out of this variety of techniques and molecules we have

shown that: (1) high resolution dispersed fluorescence allows us to... (More)
This thesis summarises experimental results on the molecular spectroscopy

of gas phase molecules excited by synchrotron radiation in the VUV and soft

X-ray regions. We have used three different detection techniques, photon in-

duced fluorescence spectroscopy, photoionisation mass spectroscopy and near

edge X-ray absorption fine structure spectroscopy to study molecular deu-

terium, hydrogen sulphide, ammonia, methanol, pyridine, pyridazine, pyrim-

idine, pyrazine, s-triazine, and 2-deoxy-D-ribose, the last one also known as

the DNA sugar. Out of this variety of techniques and molecules we have

shown that: (1) high resolution dispersed fluorescence allows us to identify

vibrational and rotational bands in molecular deuterium, as well as to esti-

mate the predissociation probability of the same molecule [paper I]; (2) the

main species fluorescing after core excitation of methane, ammonia [paper

III], hydrogen sulphide [paper II], pyridine, pyrimidine and s-triazine is H

Balmer α, followed by fluorescence from ionised species, molecular bands and

Balmer β, γ , δ; (3) the Rydberg enhancement seen in fluorescence measure-

ments of water [Melero et al. PRL 96 (2006) 063003], corroborated later in

H2 S [paper II], N H3 [paper III] and C H4 [paper III] and postulated as gen-

eral behaviour for molecules formed by low-Z atoms, is also seen in larger

organic cyclic molecules, e.g. azabenzenes; (4) when dissociative ionisation

of pyridine, pyridazine, pyrimidine, pyrazine, s-triazine and 2-deoxy-D-ribose

occurs, concerted bond rearrangement and nuclear motion takes place as op-

posed to stepwise dissociation [papers V and VI]. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Sorensen, Stacey, Lunds Universitet
publishing date
type
Thesis
publication status
published
subject
pages
149 pages
publisher
KTH
defense location
Albanova, Stockholm
defense date
2008-03-13 10:15
ISBN
978-91-7178-852-8
language
English
LU publication?
no
id
1e0d2eec-fbe8-481c-a9f8-f250f7772e6d (old id 1155877)
date added to LUP
2008-06-04 09:55:40
date last changed
2016-09-19 08:45:02
@phdthesis{1e0d2eec-fbe8-481c-a9f8-f250f7772e6d,
  abstract     = {This thesis summarises experimental results on the molecular spectroscopy <br/><br>
of gas phase molecules excited by synchrotron radiation in the VUV and soft <br/><br>
X-ray regions. We have used three different detection techniques, photon in- <br/><br>
duced fluorescence spectroscopy, photoionisation mass spectroscopy and near <br/><br>
edge X-ray absorption fine structure spectroscopy to study molecular deu- <br/><br>
terium, hydrogen sulphide, ammonia, methanol, pyridine, pyridazine, pyrim- <br/><br>
idine, pyrazine, s-triazine, and 2-deoxy-D-ribose, the last one also known as <br/><br>
the DNA sugar. Out of this variety of techniques and molecules we have <br/><br>
shown that: (1) high resolution dispersed fluorescence allows us to identify <br/><br>
vibrational and rotational bands in molecular deuterium, as well as to esti- <br/><br>
mate the predissociation probability of the same molecule [paper I]; (2) the <br/><br>
main species fluorescing after core excitation of methane, ammonia [paper <br/><br>
III], hydrogen sulphide [paper II], pyridine, pyrimidine and s-triazine is H <br/><br>
Balmer α, followed by fluorescence from ionised species, molecular bands and <br/><br>
Balmer β, γ , δ; (3) the Rydberg enhancement seen in fluorescence measure- <br/><br>
ments of water [Melero et al. PRL 96 (2006) 063003], corroborated later in <br/><br>
H2 S [paper II], N H3 [paper III] and C H4 [paper III] and postulated as gen- <br/><br>
eral behaviour for molecules formed by low-Z atoms, is also seen in larger <br/><br>
organic cyclic molecules, e.g. azabenzenes; (4) when dissociative ionisation <br/><br>
of pyridine, pyridazine, pyrimidine, pyrazine, s-triazine and 2-deoxy-D-ribose <br/><br>
occurs, concerted bond rearrangement and nuclear motion takes place as op- <br/><br>
posed to stepwise dissociation [papers V and VI].},
  author       = {Vall-llosera, Gemma},
  isbn         = {978-91-7178-852-8},
  language     = {eng},
  pages        = {149},
  publisher    = {KTH},
  title        = {Synchrotron radiation studies of gas phase molecules; from hydrogen to DNA sugars},
  year         = {2008},
}