@article{7243,
  author = {J. Oomens and A. R. Moehlig and T. H. Morton},
  title = {Infrared Multiple Photon Dissociation (IRMPD) Spectroscopy of the Proton-Bound Dimer of 1-Methylcytosine in the Gas Phase},
  abstract = {The vibrational spectrum of a hemiprotonated pair of the nucleobase cytosine has been recorded in the 300-1810 cm(-1) domain using action spectroscopy on electrosprayed positive ions with a free-electron laser. The singly charged gaseous cation has the same structure as that reported from crystallography, inferred from a strong absorption seen at 1761 cm(-1), identified as the carbonyl stretch of the protonated ring mixed with in-plane bending of the bridging H+ based on a 29 cm(-1) shift to lower frequency when all five of the exchangeable hydrogens are replaced by deuterium. IRMPD expels the neutral from the proton-bound dimer, leaving behind a protonated monomer. Whereas the bridging H+ in the dimer ion lies between the nitrogens of the two rings, IRMPD of the protonated monomer ion resulting from the dimer shows its H+ preferably situated on the carbonyl oxygen, indicating that the proton moves from one basic atom to another when the dimer ion dissociates.},
  year = {2010},
  journal = {Journal of Physical Chemistry Letters},
  volume = {1},
  number = {19},
  pages = {2891-2897},
  month = {Oct},
  isbn = {1948-7185},
  url = {<Go to ISI>://000282727700026 },
  note = {ISI Document Delivery No.: 661KRTimes Cited: 0Cited Reference Count: 60},
  language = {English},
}