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

Författare:
Publiceringsår: 2008
Språk: Engelska
Sidor:
Dokumenttyp: Doktorsavhandling
Förlag: KTH

Sammanfattning

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].

Disputation

2008-03-13
10:15
Albanova, Stockholm
  • Stacey Sorensen

Nyckelord

  • Electrical Engineering, Electronic Engineering, Information Engineering

Övriga

Published
  • ISBN: 978-91-7178-852-8

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