Slow photoelectron velocity-map imaging spectroscopy of cold negative ions

Christian Hock, Jongjin B. Kim, Marissa L. Weichman, Tara I. Yacovitch, Daniel M. Neumark

Research output: Contribution to journalArticlepeer-review

97 Scopus citations


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.

Original languageEnglish (US)
Article number244201
JournalJournal of Chemical Physics
Issue number24
StatePublished - Dec 28 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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