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

Kang, Hyuk

Permalink

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

Description

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

Date of Ingest

2016-01-05T20:04:31Z

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

Genre of Resource

Conference Paper / Presentation

Language

English

Permalink

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

Owning Collections