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PROJECTS:

1990 - 2000:

CT Exciton Echoes in Organic Molecular Crystals.

Picosecond Spectroscopy of Excited States Based on the Non Linear Electron Photoemission.

Device for the Femtosecond Pulse Measurements.

Mechanisms of Charge Transfer in Organic Molecules.

New York University, New York, USA.

1986 - 1990:

Tunneling Spectroscopy of the Vanadil Phthalocianine Monolayers.

Institute of Physics and Energetics, Latvian Academy of Sciences, Riga, Latvia.

1977 - 1986:

Laser Interferometry and Optical Spectroscopy of the Polar Organic Molecular Crystals.

Institute of Physics and Energetics, Latvian Academy of Sciences, Riga, Latvia.

EXPERTIZE:

Laser Spectroscopy, Interferometry, Picosecond Photoemission, High Vacuum Technique, Digital/Analog Electronics, Programming.

AWARD:

Research Prize of the Latvian Academy of Sciences, 1998.

PATENTS:

PUBLICATIONS:

Proton-Coupled Electron-Transfer Reactions at a Distance in DNA Duplexes: Kinetic Deuterium Isotope Effect.     Shafirovich, Vladimir; Dourandin, Alexander; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Journal of Physical Chemistry B  (2001),  105(35),  8431-8435.

The carbonate radical is a site-selective oxidizing agent of guanine in double-stranded oligonucleotides.  Shafirovich, Vladimir; Dourandin, Alexander; Huang, Weidong; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Journal of Biological Chemistry  (2001),  276(27),  24621-24626. 

Charge-transfer exciton echoes in organic molecular crystals.     Pope, Martin; Swenberg, Charles E.; Dourandin, Alexandre.    Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Mol. Cryst. Liq. Cryst. Sci. Technol., Sect. A  (2001),  355  77-84. 

Nitrogen Dioxide as an Oxidizing Agent of 8-Oxo-7,8-dihydro-2'-deoxyguanosine but Not of 2'-Deoxyguanosine.     Shafirovich, Vladimir; Cadet, Jean; Gasparutto, Didier; Dourandin, Alexander; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Chemical Research in Toxicology  (2001),  14(2),  233-241. 

Direct Spectroscopic Observation of 8-Oxo-7,8-dihydro-2'-deoxyguanosine Radicals in Double-Stranded DNA Generated by One-Electron Oxidation at a Distance by 2-Aminopurine Radicals.     Shafirovich, Vladimir; Cadet, Jean; Gasparutto, Didier; Dourandin, Alexander; Huang, Weidong; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Journal of Physical Chemistry B  (2001),  105(2),  586-592.

Electron transfer at a distance induced by site-selective photoionization of 2-aminopurine in oligonucleotides and investigated by transient absorption techniques.     Shafirovich, Vladimir; Dourandin, Alexander; Huang, Weidong; Luneva, Natalia P.; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Phys. Chem. Chem. Phys.  (2000),  2(19),  4399-4408. 

New broad spectrum autocorrelator for ultrashort light pulses based on multiphoton photoemission.     Dourandin, Alexander; Brenner, Henry C.; Pope, Martin.    Department of Chemistry,  New York University,  New York,  NY,  USA.    Rev. Sci. Instrum.  (2000),  71(4),  1589-1594. 

Proton-coupled electron transfer in the oxidation of guanines by an aromatic pyrenyl radical cation in aqueous solutions.     Kuzmin, Vladimir A.; Dourandin, Alexander; Shafirovich, Vladimir; Geacintov, Nicholas E.    Chem. Dep. and Radiation Solid State Lab.,  New York Univ.,  New York,  NY,  USA.    Phys. Chem. Chem. Phys.  (2000),  2(7),  1531-1535. 

Acid-base equilibria in aqueous solutions of 2-aminopurine radical cations generated by two-photon photoionization.     Shafirovich, Vladimir; Dourandin, Alexander; Luneva, Natalia P.; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Perkin 2  (2000),   (2),  271-275. 

The Kinetic Deuterium Isotope Effect as a Probe of a Proton Coupled Electron Transfer Mechanism in the Oxidation of Guanine by 2-Aminopurine Radicals.     Shafirovich, Vladimir; Dourandin, Alexander; Luneva, Natalia P.; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    J. Phys. Chem. B  (2000),  104(1),  137-139.

Oxidation of Guanine at a Distance in Oligonucleotides Induced by Two-Photon Photoionization of 2-Aminopurine.     Shafirovich, Vladimir; Dourandin, Alexander; Huang, Weidong; Luneva, Natalia P.; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    J. Phys. Chem. B  (1999),  103(49),  10924-10933. 

Multiphoton near-infrared femtosecond laser pulse-induced DNA damage with and without the photosensitizer proflavine.     Shafirovich, Vladimir; Dourandin, Alexander; Luneva, Natalia P.; Singh, Carolyn; Kirigin, Francis; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    Photochem. Photobiol.  (1999),  69(3),  265-274. 

Long-range transfer of reactive intermediate species in photoexcited, site-specific photosensitizer-modified DNA.     Huang, W.; Liu, T. M.; Dourandin, A.; Shafirovich, V.; Geacintov, N. E.    Chemistry Department,  New York University,  NY,  USA.    Book of Abstracts, 216th ACS National Meeting, Boston, August 23-27  (1998),     TOXI-029.  Publisher: American Chemical Society,  Washington, D. C. 

Migration and Trapping of Photoinjected Excess Electrons in Double-Stranded B-Form DNA But Not in Single-Stranded DNA.     Shafirovich, Vladimir Ya.; Dourandin, Alexander; Luneva, Natalia P.; Geacintov, Nicholas E.    Chemistry Department and Radiation and Solid State Laboratory,  New York University,  New York,  NY,  USA.    J. Phys. Chem. B  (1997),  101(30),  5863-5868. 

Laser Pulse-Induced Photochemical Strand Cleavage of Site-Specifically and Covalently Modified (+)-anti-Benzo[a]pyrene Diol Epoxide-Oligonucleotide Adducts.     Li, Bin; Mao, Bing; Liu, Tong-Ming; Xu, Jing; Dourandin, Alexander; Amin, Shantu; Geacintov, Nicholas E.    Chemistry Department,  New York University,  New York,  NY,  USA.    Chem. Res. Toxicol.  (1995),  8(3),  396-402. 

Picosecond Spectroscopy of Exited States Based on Non-Linear Electron Photoemission. A. Durandin, T.-M. Liu, M. Pope, S.-C.Shue, N.E. Geacintov.  J. Phys. Chem. 1993, 97, 2-4.

Visible Fluorescence On IR Excitation of Polar Dimethylaminobenxylidene 1,3 - Indandione Crystals. L.Valkunas, D.Juodzbalis, A.Urbas, A.Gruodis, A.Durandin, E.A.Silinsh, A.Klimkans, S.Larssons.  Advanced Materials for Optics and Electronics 1993, 2, 231-239.

Photorefraction and electrorefraction of betaine-2-N-pyridinium indane-1,3-dione.     Gailis, A.; Durandin, A.; Silins, E.    Fiz.-Energ. Inst.,  Riga,  USSR.    Latv. PSR Zinat. Akad. Vestis, Fiz. Teh. Zinat. Ser.  (1989),   (1),  21-28.

Structure-determined optical properties of indandione pyridinium betaine (IPB) crystals.     Eiduss, J.; Taure, L.; Durandin, A.; Muzikante, I.; Gailis, A.    Latv. State Univ.,  Riga,  USSR.    Potsdamer Forsch. Paedagog. Hochsch. "Karl Liebknecht" Potsdam, Naturwiss. Reihe  (1986),  47  8-10.

Local states and their role in real organic molecular crystals.     Taure, L.; Durandin, A. D.; Gailis, A.; Muzikante, I.; Silins, E.    Inst. Phys. Energ.,  Riga,  USSR.    Potsdamer Forsch. Paedagog. Hochsch. "Karl Liebknecht" Potsdam, Naturwiss. Reihe  (1986),  47  76-8.

Luminescence of crystalline samples of betaine 2-N-pyridinium 1,3-indandione.     Durandin, A. D..    Fiz.-Energ. Inst.,  Riga,  USSR.    Latv. PSR Zinat. Akad. Vestis, Fiz. Teh. Zinat. Ser.  (1984),   (4),  54-58.

Variations in the refractive index of betaine 2-N-pyridiniumindan-1,3-dione films.     Gailis, A.; Durandin, A. D.; Skudra, V.    Fiz. Energ. Inst.,  Riga,  USSR.    Latv. PSR Zinat. Akad. Vestis, Fiz. Teh. Zinat. Ser.  (1983),   (5),  119-21.

Device for studying changes in the refractive index of photodielectric layers.     Gailis, A.; Durandin, A. D..    Fiz.-Energ. Inst.,  Riga,  USSR.    Prib. Tekh. Eksp.  (1983),   (2),  178-9.

Motion of electron-hole drops in the presence of mutual repulsion forces.     Durandin, A. D.; Sibel'din, N. N.; Stopachinskii, V. B.; Tsvetkov, V. A.    Fiz. Inst. im. Lebedeva,  Moscow,  USSR.    Pis'ma Zh. Eksp. Teor. Fiz.  (1977),  26(5),  295-8.