Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 137, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4772406
Keywords
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Funding
- Air Force Office of Scientific Research [FA9550-12-1-0160]
- Defense University Research Instrumentation Program (DURIP) [FA9550-11-1-0300]
- German Academic Exchange Service (DAAD)
- National Science Foundation (NSF)
- National Science and Engineering Research Council of Canada (NSERC)
- Direct For Mathematical & Physical Scien [840505] Funding Source: National Science Foundation
- Division Of Chemistry [840505] Funding Source: National Science Foundation
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Anion slow photoelectron velocity-map imaging (SEVI) spectroscopy is a high-resolution variant of photoelectron spectroscopy used to study the electronic and geometric structure of atoms, molecules, and clusters. To benefit from the high resolution of SEVI when it is applied to molecular species, it is essential to reduce the internal temperature of the ions as much as possible. Here, we describe an experimental setup that combines a radio-frequency ion trap to store and cool ions with the high-resolution SEVI spectrometer. For C-5(-), we demonstrate ion temperatures down to 10 +/- 2 K after extraction from the trap, as measured by the relative populations of the two anion spin-orbit states. Vibrational hot bands and sequence bands are completely suppressed, and peak widths as narrow as 4 cm(-1) are seen due to cooling of the rotational degrees of freedom. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772406]
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