Synchrotron radiation studies of gas phase molecules: from hydrogen to DNA sugars
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
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 induced ﬂuorescence spectroscopy, photoionisation mass spectroscopy and near edge X-ray absorption ﬁne structure spectroscopy to study molecular deuterium, hydrogen sulphide, ammonia, methanol, pyridine, pyridazine, pyrimidine, 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 estimate 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 measurements of water [Melero et al. PRL 96 (2006) 063003], corroborated later in H2S [paper II], NH3 [paper III] and CH4 [paper III] and postulated as general 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 opposed to stepwise dissociation [papers V and VI].
Place, publisher, year, edition, pages
Stockholm: KTH , 2008. , x, 56 p.
Trita-FYS, ISSN 0280-316X ; 2008:1
KTH thesis, synchrotron radiation, gas phase, bio molecules
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-4640ISBN: 978-91-7178-852-8OAI: oai:DiVA.org:kth-4640DiVA: diva2:13205
2008-03-13, FA31, Albanova, Roslagstullabacken 21, Stockholm, 10:15
Sorensen, Stacey, Prof. Dr.
QC 201009162008-02-202008-02-202010-09-16Bibliographically approved
List of papers