IR photodissociation spectroscopy of O 4 +, O 6 + and O 8 + cluster ions

O 4 + and larger (O 2) n + cluster ions are produced in a pulsed discharge source and studied with time-of-flight mass spectrometry and infrared laser photodissociation spectroscopy. The infrared laser photon energies used allow bracketing of the cluster dissociation energies. Sharp resonant structu...

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Bibliographic Details
Published inInternational journal of mass spectrometry Vol. 283; no. 1; pp. 69 - 76
Main Authors Ricks, A.M., Douberly, G.E., Duncan, M.A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2009
Subjects
Clusters
Infrared
Ion spectroscopy
Infrared
Clusters
Ion spectroscopy
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Summary:O 4 + and larger (O 2) n + cluster ions are produced in a pulsed discharge source and studied with time-of-flight mass spectrometry and infrared laser photodissociation spectroscopy. The infrared laser photon energies used allow bracketing of the cluster dissociation energies. Sharp resonant structure is detected for each of these ions in the region of the O–O stretching vibrations and also at higher frequencies corresponding to combination bands. Although previous matrix isolation spectroscopy on O 4 + found evidence for both trans-bent and rectangular isomers of this ion, the gas phase IR spectrum only contains bands assigned to the rectangular isomer. O 6 + has a distinctive IR spectrum unlike that for O 4 +, indicating that it is not simply a solvated O 4 + species, while O 8 + has the signature of a solvated O 6 + ion.
ISSN:1387-3806
1873-2798
DOI:10.1016/j.ijms.2009.01.009