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Oleg Boyarkine

Cette personne a quitté l’EPFL

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Publications associées (73)

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Method and apparatus for the analysis of molecules using mass spectrometry and optical spectroscopy

Oleg Boyarkine, Vladimir Kopysov

A method of analyzing molecules enabling chemical, structural and isomeric or conformational identification of the molecules, particularly in a stream from a chromatographic separation, comprising: generating ions from a sample of molecules to be analyzed; ...

2016

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

Thomas Rizzo, Oleg Boyarkine

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

Quantification of enantiomers and blind identification of erythro-sphingosine non-racemates by cold ion spectroscopy

Oleg Boyarkine, Vladimir Kopysov, Ruslan Yamaletdinov

Enantiomers of a lipid erythro-sphingosine have been quantified with ≈4% accuracy by UV cold ion spectroscopy of their non-covalent complexes with a chiral aromatic molecule. The diastereomeric configuration of such complexes enables the quantification usi ...

2024

Gas-phase structures reflect the pain-relief potency of enkephalin peptides

Oleg Boyarkine, Vladimir Kopysov, Aleksandr Pereverzev

We use cold ion spectroscopy and quantum-chemical computations to solve the structures of opioid peptides enkephalins in the gas phase. The derived structural parameters clearly correlate with the known pharmacological efficiency of the studied drugs, sugg ...

2019

Feshbach resonances in the water molecule revealed by state-selective spectroscopy

Thomas Rizzo, Oleg Boyarkine, Pavlo Maksyutenko, Maxim Grechko

We employ triple-resonance vibrational overtone excitation to access quasibound states of water from several fully characterized bound states of the molecule. Comparison of the measured dissociation spectra allows a rigorous assignment of rotational quantu ...

American Institute of Physics2010

Collisionally-assisted spectroscopy of water from 27000 to 34000 cm-1

Thomas Rizzo, Oleg Boyarkine, Pavlo Maksyutenko, Maxim Grechko

We report here an experimental approach that enables measurement of weak transitions to a wide range of rovibrational levels of water in the energy region 27000-34200 cm-1. We have previously demonstrated the use of laser double-resonance overtone excitati ...

2008

Cold Ion Spectroscopy Reveals the Intrinsic Structure of a Decapeptide

Ursula Röthlisberger, Ivano Tavernelli, Thomas Rizzo, Oleg Boyarkine, Natalia Nagornova, Manuel Dömer, Matteo Guglielmi

Wiley-VCH Verlag GmbH2011

Communication: Feshbach resonances in the water molecule revealed by state-selective spectroscopy (vol 133, 081103, 2010)

Thomas Rizzo, Oleg Boyarkine, Pavlo Maksyutenko, Maxim Grechko

2010

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

Thomas Rizzo, Oleg Boyarkine

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

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

Thomas Rizzo, Oleg Boyarkine

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

Dissociation threshold of H218O: Validating ab initio calculations by state-selective triple-resonance spectroscopy

Oleg Boyarkine

We employ state-selective triple-resonance vibrational overtone spectroscopy for a direct measurement of the lowest dissociation energy, Do, in the (H2O)-O-18 molecule. The measured value of 41 154.22 +/- 0.25 cm(-1) is in an excellent agreement with that, ...

Elsevier2015

Efficient, highly selective laser isotope separation of carbon-13

Thomas Rizzo, Oleg Boyarkine

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

Vibrational Signatures of Conformer-Specific Intramolecular Interactions in Protonated Tryptophan

Oleg Boyarkine, Natalia Nagornova, Aleksandr Pereverzev

Because of both experimental and computational challenges, protonated tryptophan has remained the last aromatic amino acid for which the intrinsic structures of low-energy conformers have not been unambiguously solved. The IR-IR UV hole-burning spectroscop ...

Amer Chemical Soc2016