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Ultrafast dynamics of strong-field dissociative ionization ofCH2Br2 probed by femtosecond soft x-ray transient absorption spectroscopy

Description: Femtosecond time-resolved soft x-ray transient absorption spectroscopy based on a high-order harmonic generation source is used to investigate the dissociative ionization of CH{sub 2}Br{sub 2} induced by 800 nm strong-field irradiation. At moderate peak intensities (2.0 x 10{sup 14} W/cm{sup 2}), strong-field ionization is accompanied by ultrafast C-Br bond dissociation, producing both neutral Br ({sup 2}P{sub 3/2}) and Br* ({sup 2}P{sub 1/2}) atoms together with the CH{sub 2}Br{sup +} fragment… more
Date: January 15, 2008
Creator: Loh, Zhi-Heng & Leone, Stephen R.
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Partner: UNT Libraries Government Documents Department
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Strong field atomic physics in the mid-infrared

Description: We examine strong field atomic physics in a wavelength region (3-4 microns) where very little work has previously been done. The soft photon energy allows the exploration of one-electron atoms with low binding energies (alkali metals). We find that photoionization spectra differ from rare gas studies at shorter wavelengths due to more complex ion core potentials. Harmonic generation is studied, and we find that harmonic bandwidths are consistent with theory and the possibility of compression to… more
Date: March 15, 2000
Creator: Sheehy, B.; Martin, J. D. D.; Clatterbuck, T. O.; Kim, D. W.; DiMauro, L. F.; Agostini, P. et al.
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Partner: UNT Libraries Government Documents Department
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Preliminary Results of the Echo-Seeding Experiment ECHO-7 at SLAC

Description: ECHO-7 is a proof-of-principle echo-enabled harmonic generation FEL experiment in the Next Linear Collider Test Accelerator (NLCTA) at SLAC. The experiment aims to generate coherent radiation at 318 nm and 227 nm, which are the 5th and 7th harmonic of the infrared seed laser. In this paper we present the preliminary results from the commissioning run of the completed experimental setup which started in April 2010.
Date: June 15, 2010
Creator: Xiang, D.; Colby, E.; Ding, Y.; Dunning, M.; Frederico, J.; Gilevich, S. et al.
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Partner: UNT Libraries Government Documents Department
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Calculations of strong field multiphoton processes in alkali metal atoms

Description: The development of a new class of laser systems: capable of producing intense radiation in the mid-infrared (MIR) regime (photon energies between 0.3 and 0.4 eV), opens the possibility of observing multiphoton processes in a new class of systems with lower ionization potentials than those previously studied. Of particular interest are the alkali metal atoms, which are true one-(valence)-electron systems. We present theoretical calculations of above threshold ionization (ATI) and high harmonic g… more
Date: March 15, 2000
Creator: Schafer, K. J.; Gaarde, M. B.; Kulander, K. C.; Sheehy, B. & DiMauro, L. F.
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Partner: UNT Libraries Government Documents Department
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