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Photochemical selectivity in guanine-cytosine base-pair structures.
Prebiotic chemistry presumably took place before formation of an oxygen-rich atmosphere and thus under conditions of intense short wavelength UV irradiation. Therefore, the UV photochemical stabilityExpand
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REMPI spectroscopy of cytosine
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 exhibitsExpand
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On the Photochemistry of Purine Nucleobases
We present R2PI spectra of a series of purine nucleobases, nucleosides, and related derivatives, including adenine, guanine, guanosine, 2-aminopurine, 2,6-diaminopurine, 9-ethyladenine, andExpand
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REMPI Spectroscopy of Jet-Cooled Guanine
Figure 1. REMPI spectrum of jet-cooled guanine. The spectrum consists of four parts, as indicated by the horizontal arrows, that were recorded independently. In each part the ionization laser fluenceExpand
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Spectroscopy of isolated gramicidin peptides.
Many details of intrinsic properties of biomolecules are masked by elements of the biological environment, such as the solvent and intermolecular interactions. Separation of the interandExpand
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Conformational structure of tyrosine, tyrosyl-glycine, and tyrosyl-glycyl-glycine by double resonance spectroscopy.
We investigated the variation in conformation for the amino acid tyrosine (Y), alone and in the small peptides tyrosine-glycine (YG) and tyrosine-glycine-glycine (YGG), in the gas phase by usingExpand
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Resonance-Enhanced Multiphoton Ionization Spectroscopy of Dipeptides
We report resonance-enhanced multiphoton ionization (REMPI) spectroscopy of laser-desorbed, jet-cooled dipeptides, containing either tyrosine or phenylalanine as an aromatic chromophore (C). TheExpand
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Gas phase spectroscopy of the pentapeptide FDASV
Abstract IR–UV double resonance spectroscopy of the laser-desorbed, jet-cooled pentapeptide FDASV shows only one type of conformer in the gas phase. Comparison with computations at the B3LYP/6-31G ∗∗Expand
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An in situ silver cationization method for hydrocarbon mass spectrometry
We have developed a novel cationization method for the analysis of long-chain hydrocarbons via UV laser desorption mass spectrometry. In this technique we electrospray a thin coating of AgNO3 over aExpand
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Isomer discrimination of polycyclic aromatic hydrocarbons in the Murchison meteorite by resonant ionization.
We have used two-color resonant two-photon ionization (2C-R2PI) mass spectrometry to discriminate between isomers of polycyclic aromatic hydrocarbons in the Murchison meteorite. We measured theExpand
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