Dynamics and fragmentation of van der Waals clusters: (H2O)n, (CH3OH)n, and (NH3)n upon ionization by a 26.5 eV soft x-ray laser

Dong, F., author; Rocca, Jorge J., author; Heinbuch, S., author; Bernstein, E. R., author; American Institute of Physics, publisher

Dynamics and fragmentation of van der Waals clusters: (H2O)n, (CH3OH)n, and (NH3)n upon ionization by a 26.5 eV soft x-ray laser

dc.contributor.author	Dong, F., author
dc.contributor.author	Rocca, Jorge J., author
dc.contributor.author	Heinbuch, S., author
dc.contributor.author	Bernstein, E. R., author
dc.contributor.author	American Institute of Physics, publisher
dc.date.accessioned	2007-01-03T08:10:00Z
dc.date.available	2007-01-03T08:10:00Z
dc.date.issued	2006
dc.description.abstract	A tabletop soft x-ray laser is applied for the first time as a high energy photon source for chemical dynamics experiments in the study of water, methanol, and ammonia clusters through time of flight mass spectroscopy. The 26.5 eV/photon laser (pulse time duration of ~1 ns) is employed as a single photon ionization source for the detection of these clusters. Only a small fraction of the photon energy is deposited in the cluster for metastable dissociation of cluster ions, and most of it is removed by the ejected electron. Protonated water, methanol, and ammonia clusters dominate the cluster mass spectra. Unprotonated ammonia clusters are observed in the protonated cluster ion size range 2⩽n⩽22. The unimolecular dissociation rate constants for reactions involving loss of one neutral molecule are calculated to be (0.6-2.7) × 104, (3.6-6.0) × 103, and (0.8-2.0) × 104 s−1 for the protonated water (9⩽n⩽24), methanol (5⩽n⩽10), and ammonia (5⩽n⩽18) clusters, respectively. The temperatures of the neutral clusters are estimated to be between 40 and 200 K for water clusters (10⩽n⩽21), and 50-100 K for methanol clusters (6⩽n⩽10). Products with losses of up to five H atoms are observed in the mass spectrum of the neutral ammonia dimer. Large ammonia clusters (NH3)n (n>3) do not lose more than three H atoms in the photoionization/photodissociation process. For all three cluster systems studied, single photon ionization with a 26.5 eV photon yields near threshold ionization. The temperature of these three cluster systems increases with increasing cluster size over the above-indicated ranges.
dc.format.medium	born digital
dc.format.medium	articles
dc.identifier.bibliographicCitation	Dong, F., et al., Dynamics and Fragmentation of van der Waals Clusters: (H2O)n, (CH3OH)n, and (NH3)n upon Ionization by a 26.5 eV Soft X-Ray Laser, Journal of Chemical Physics 124, no. 22 (June 14, 2006): 224319-1-224319-17.
dc.identifier.uri	http://hdl.handle.net/10217/67517
dc.language	English
dc.language.iso	eng
dc.publisher	Colorado State University. Libraries
dc.relation.ispartof	Faculty Publications
dc.rights	©2006 American Institute of Physics.
dc.rights	Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.title	Dynamics and fragmentation of van der Waals clusters: (H2O)n, (CH3OH)n, and (NH3)n upon ionization by a 26.5 eV soft x-ray laser
dc.type	Text

Files

Original bundle

Now showing 1 - 1 of 1

Name:: ECEjjr00060.pdf
Size:: 384.45 KB
Format:: Adobe Portable Document Format
Description:

Download

Collections

Faculty Publications