TY - JOUR
T1 - REMPI spectroscopy of cytosine
AU - Nir, E.
AU - Müller, M.
AU - Grace, L. I.
AU - De Vries, M. S.
N1 - Funding Information:
Cytosine, and several of its methyl derivatives exhibit vibronic spectra with sharp features in two spectral regions, separated by about . We interpret those as being due to two tautomeric forms, one keto and one enol. Dimers of these compounds absorb at intermediate wavelengths, pointing to a structure with possibly mixed tautomeric character. We are undertaking IR–UV hole burning experiments to verify the tautomer assignments and to elucidate the cluster structures. This work has been supported by the Israel Science Foundation, founded by The Israel Academy of Sciences and Humanities.
PY - 2002/3/25
Y1 - 2002/3/25
N2 - We report resonant two-photon ionization spectra of laser desorbed, jet cooled, cytosine, 1-methyl cytosine, 5-methyl cytosine, and dimers of these. Unlike other pyrimidine bases, cytosine exhibits vibronic spectra with sharp features in two spectral regions, separated by about 5000 cm-1. We interpret these as being due to two tautomeric forms, one keto and one enol. The dimers absorb at wavelengths that are intermediate between those of the two monomer forms. By UV-UV hole burning we determined the numbers of isomers contributing to each spectrum and by delayed two color ionization we determined triplet lifetimes. We observed hydrogen transfer between bases both in collisions between monomers and after photo-excitation in clusters.
AB - We report resonant two-photon ionization spectra of laser desorbed, jet cooled, cytosine, 1-methyl cytosine, 5-methyl cytosine, and dimers of these. Unlike other pyrimidine bases, cytosine exhibits vibronic spectra with sharp features in two spectral regions, separated by about 5000 cm-1. We interpret these as being due to two tautomeric forms, one keto and one enol. The dimers absorb at wavelengths that are intermediate between those of the two monomer forms. By UV-UV hole burning we determined the numbers of isomers contributing to each spectrum and by delayed two color ionization we determined triplet lifetimes. We observed hydrogen transfer between bases both in collisions between monomers and after photo-excitation in clusters.
UR - http://www.scopus.com/inward/record.url?scp=0037170886&partnerID=8YFLogxK
U2 - 10.1016/S0009-2614(02)00180-X
DO - 10.1016/S0009-2614(02)00180-X
M3 - Article
AN - SCOPUS:0037170886
SN - 0009-2614
VL - 355
SP - 59
EP - 64
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 1-2
ER -