UV-UV HOLE-BURNING SPECTROSCOPY OF A PROTONATED ADENINE DIMER IN A COLD QUADRUPOLE ION TRAP

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https://hdl.handle.net/2142/79139

Title: UV-UV HOLE-BURNING SPECTROSCOPY OF A PROTONATED ADENINE DIMER IN A COLD QUADRUPOLE ION TRAP
Author(s): Kang, Hyuk
Issue Date: 22-Jun-15
Keyword(s): Ions
Abstract: A novel method for double-resonance photofragmentation spectroscopy in a cold quadrupole ion trap has been developed and utilized to differentiate the structures of a cold protonated adenine dimer. A burn laser generates a population hole of a certain conformer of the dimer stored in a cold quadrupole ion trap, and an auxiliary dipolar RF ejects the photofragments by the burn laser from the trap. A probe laser detects depletion of a certain conformer by the burn laser, and a conformer-specific UV or IR spectrum of a cold ion is obtained by scanning the wavelength of the burn or the probe laser. This simple and versatile method is applicable to any type of double-resonance photofragmentation spectroscopy in a cold quadrupole ion trap. To demonstrate its capability, it was applied to UV-UV hole-burning spectroscopy of a protonated adenine dimer. It is proved that a cold protonated adenine dimer has at least two hydrogen-bonding geometries and each has multiple electronically excited states with significantly different spectral bandwidths, possibly due to different excited state dynamics.
Publisher: International Symposium on Molecular Spectroscopy
Type of Resource: text
Language: English
Permalink: http://hdl.handle.net/2142/79139