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Oleg Boyarkine

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Publications associées (73)

Spectroscopic probes of cold, gas-phase biomolecular ions: From amino acids to helical peptides

Oleg Boyarkine, Thomas Rizzo

2008

Spectroscopic signatures of gas-phase helices: Ac-Phe-(Ala)5-Lys-H+ and Ac-Phe-(Ala)10-Lys-H+

Oleg Boyarkine, Thomas Rizzo

We apply gas-phase double resonance spectroscopic techniques to two helical peptides, Ac-Phe-(Ala)5-Lys-H+ and Ac-Phe- (Ala)10-Lys-H+, using electrospray ionization combined with photofragmentation in a cold, 22-pole ion trap. Despite the large size of the ...

2007

Approaching the full set of energy levels of water

Oleg Boyarkine, Thomas Rizzo, Pavlo Maksyutenko

We report here measurements of rovibrational levels in the electronic ground state of water at the previously inaccessible energies above 26,000 cm-1. The use of laser double-resonance overtone excitation extends this limit to 34,200 cm-1, which correspond ...

2007

Conformation-specific spectroscopy and photodissociation of cold, protonated tyrosine and phenylalanine

Oleg Boyarkine, Thomas Rizzo, Sébastien Mercier, Monia Guidi, Caroline Seaiby

We present here ultraviolet and infrared spectra of protonated aromatic amino acids in a cold, 22-pole ion trap. Ultraviolet photofragmentation spectra of protonated tyrosine and phenylalanine show vibronically resolved bands corresponding to different sta ...

2007

Conformation-specific infrared and ultraviolet spectroscopy of tyrosine-based protonated dipeptides

Oleg Boyarkine, Thomas Rizzo, Monia Guidi

We present the spectroscopy and photofragmentation dynamics of two isomeric protonated dipeptides, H+AlaTyr and H+TyrAla, in a cold ion trap. By a combination of infrared-ultraviolet double resonance experiments and density functional theory calculations, ...

2007

Conformational dependence of intramolecular vibrational redistribution in methanol

Oleg Boyarkine, Thomas Rizzo, Pavlo Maksyutenko

Previous state-selected spectra of methanol in the 5ν1 OH stretch overtone region [O. V. Boyarkin, T. R. Rizzo, and D. S. Perry, J. Chem. Phys. 110 (23), 11346 (1999)] revealed structure indicating intramolecular vibrational redistribution (IVR) on three t ...

2007

Isotopically selective collisional vibrational energy transfer in CF3H

Oleg Boyarkine, Thomas Rizzo

We investigate here the mechanism of collisionally-enhanced isotopic selectivity observed in infrared multiple photon dissociation (IRMPD) of vibrationally pre-excited CF3H by Boyarkin et al. (J. Chem. Phys. 118, 93 (2003)). For both the carbon-12 and carb ...

2007

Microsolvation effects on the excited state dynamics of protonated tryptophan

Oleg Boyarkine, Thomas Rizzo, Sébastien Mercier, Anthi Kamariotou, Ursula Röthlisberger, Ivano Tavernelli, Matteo Guglielmi, Michele Cascella

To better understand the complex photophysics of the amino acid tryptophan, which is widely used as a probe of protein structure and dynamics, we have measured electronic spectra of protonated, gas-phase tryptophan solvated with a controlled number of wate ...

2006

Efficient, highly selective laser isotope separation of carbon-13

Oleg Boyarkine, Thomas Rizzo

We recently demonstrated an original approach to highly selective laser isotope separation of carbon-13 that employs vibrational overtone pre-excitation of CF3 H together with infrared multiphoton dissociation [O.V. Boyarkin, M. Kowalczyk, T.R. Rizzo, J. C ...

Springer-Verlag2006

Electronic spectroscopy of cold, protonated tryptophan and tyrosine

Oleg Boyarkine, Thomas Rizzo, Sébastien Mercier, Anthi Kamariotou

We report here a new method to obtain electronic spectra of biomolecular ions that are produced in the gas phase by electrospray and cooled to ~10K in a 22-pole ion trap, and we demonstrate this technique by applying it to protonated tryptophan and tyrosin ...

2006

Infrared spectroscopy of hydrated amino acids in the gas phase: protonated and lithiated valine

Oleg Boyarkine, Thomas Rizzo, Rainer Beck, Sébastien Mercier, Anthi Kamariotou, Evan Rowland Williams

We report here infrared spectra of protonated and lithiated valine with varying degrees of hydration in the gas phase and interpret them with the help of DFT calculations at the B3LYP/6-31++G** level. In both the protonated and lithiated species, our resul ...

2006

A direct measurement of the dissociation energy of water

Oleg Boyarkine, Thomas Rizzo, Pavlo Maksyutenko

We have performed a direct measurement of one of the most fundamental thermochemical values: the O-H bond energy in water. Using a triple-resonance laser excitation scheme, we excite the molecule through a series of vibrational overtone transitions to acce ...

2006

Vibrational overtone spectroscopy of jet-cooled methanol from 5000 to 14000 cm(-1)

Oleg Boyarkine, Thomas Rizzo

Spectra of jet-cooled methanol in the overtone and combination region from 5000 to, 14000 cm(-1) have been obtained by means of infrared laser-assisted photofragment spectroscopy. Many of the observed features are assigned to combination bands of the type ...

2005

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