个人简介

Ph.D., 1972, Weizmann Institute of Science B.S., 1964, Hebrew University of Jerusalem

研究领域

Physical Chemistry

We study detailed mechanisms of photoinitiated chemical reactions in gas and condensed phases. Our goal is to understand reactive processes at a fundamental level, in particular those important in the atmosphere. Primary events, nonadiabatic transitions and the influence of the environment on reaction outcomes are examined. We exploit molecular beams for reactant kinetic energy control, state-specific laser excitations for varying reactants vibrational energy, and a variety of laser-spectroscopies and imaging for product diagnostics. As an example, consider the technique of photoelectron and photofragment ion imaging. Here, "snapshots" of fragmentation or reactions are recorded with a position sensitive detector and a CCD camera. A single image interrogates state-selected products revealing their velocity and angular distributions, from which the reaction time scale and mechanisms are deduced. Photoelectron images pinpoint surface crossings that lead to dissociation and how ground and excited states of molecules are ionized. They are recorded using velocity mapping by projecting the photoelectrons on a position-sensitive detector. From the resulting image a complete 3D velocity distribution, including the speed and angular distributions, can be efficiently reconstructed using a method developed by our group and described in our group web site. The speed distribution represents the photoelectron or photofragment energy spectrum. The angular distributions convey information about the parent molecular orbitals and dissociation timescale. This technique allows us to rapidly obtain "road maps" for complex dissociation and ionization events that are germane to real-life environments. We also obtain correlated distributions, i.e. the state distribution of one product correlated with a specific state of the other, helping to sort among possible mechanisms. The image on the left is of an HCl fragment in J=5 from the dissociation of the acetylene-HCl dimer (middle). The plot on the right displays the kinetic energy of the HCl(J=5) fragment from which the correlated rotational distribution of the acetylene co-fragment is obtained.

近期论文

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Reconstruction of Abel-transformable images: The Basis-Set Expansion Abel Transform method, V. Dribinski, A. Ossadtchi, V. A. Mandelshtam, and H. Reisler, Rev. Sci. Instrum. 73, 2634 (2002). Competitive C–H and O–D bond fission channels in the UV photodissociation of the deuterated hydroxymethyl radical CH2OD, L. Feng, A. V. Demyanenko, and H. Reisler, J. Chem. Phys.120, 6524-6530 (2004). Femtosecond multidimensional imaging of a molecular dissociation, Geßner, O; et al., Science, 311, 219-222 (2006). Amorphous Solid Water Films: Transport and Guest-Host Interactions with CO2 and N2O Dopants, G. Kumi, S. Malyk, S. Hawkins, H. Reisler, and C. Wittig, J. Phys. Chem. A, 110, 2097-2105 (2006). Vibronic structure and ion core interactions in rydberg states of diazomethane: An experimental and theoretical investigation, Fedorov, I., Koziol, L., Li, G. S., Parr, J. A., Reisler, H., and Krylov, A. I. J. Phys. Chem. A, 111, 13347-13357 (2007). Electronic spectroscopy and photodissociation dynamics of the 1-hydroxyethyl radical CH3CHOH, B. Karpichev, L.W. Edwards, J. Wei and H. Reisler, J. Phys. Chem. A, 112: 412-418 (2008). Photofragment spectroscopy and predissociation dynamics of weakly bound molecules, Hanna Reisler, Annu. Rev. Phys. Chem. 60, 39-59 (2009). Interacting Rydberg and valence states in radicals and molecules: Experimental and theoretical studies, H. Reisler and A.I. Krylov, Int. Rev. Phys. Chem., 28(2) 267-308(2009). Imaging the state-specific vibrational predissociation of the NH3-H2O hydrogen-bonded dimer, A. K. Mollner, B. E. Casterline, L. C. Ch'ng, and H. Reisler, J. Phys. Chem. A. 113, 10174-83 (2009). Imaging H2O Photofragments in the Predissociation of the HCl-H2O Hydrogen-Bonded Dimer, by B.E. Rocher-Casterline, A.K. Mollner, L. C. Ch’ng, and H. Reisler, J. Phys. Chem. A (P. Toenies Festschrift) 115 (25), 6903-6909 (2011); dx.doi.org/10.1021/jp112024s. Imaging the State-Specific Vibrational Predissociation of the Water-Water Hydrogen-Bonded Dimer, B.E. Rocher-Casterline, L. C. Ch’ng, A.K. Mollner, and H. Reisler, J. Chem Phys. 134, 211101 (2011). Amorphous Solid Water: Pulsed Laser Ablation of ASW/CO2 Thin Films, Rebolledo-Mayoral, O.; Stromberg, J; McKean, S; Reisler, Hanna; Wittig, C., J. Phys. Chem. B, 116, 563-569 (2012). Overtone-induced dissociation and isomerization dynamics of the hydroxymethyl radical (CH2OH and CD2OH). I. A theoretical study, E. Kamarchik, C. Rodrigo, J.M. Bowman, H. Reisler, and A. I. Krylov. J. Chem. Phys. 136, 084304 (2012); II. Velocity map imaging studies, M. Ryazanov, C. Rodrigo and H. Reisler, J. Chem. Phys. 136, 084305 (2012).