期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 113, 期 17, 页码 4829-4832出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp811107x
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Two methods of preparing guanine in the gas phase, thermal vaporization and laser desorption, have been investigated. The guanine generated by each method is entrained in a molecular beam, single-photon ionized with tunable VUV synchrotron radiation, and analyzed using reflectron mass spectrometry. The recorded photoionization efficiency (PIE) curves show a dramatic difference for experiments performed via thermal vaporization compared to that with laser desorption. The calculated vertical and adiabatic ionization energies for the eight lowest-lying tautomers Of guanine suggest that the experimental observations arise from different tautomers being populated in the two different experimental methods.
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