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Topic Area: Chemical Physics
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Displaying records 11 to 20 of 31 records.
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11. Hot-Electron Femtochemistry at Surfaces: On the Role of Multiple Electron Processes in Desorption
Topic: Chemical Physics
Published: 1/1/2000
Author: John William Gadzuk
Abstract: Aspects of molecular processes at surfaces due to sub-ps laser pulses of visible light are discussed here. Within the limits of the standard two-temperature model describing the temporatl evolution of fs laser-excited substrate electrons, a theoreti ...

12. Infrared and far-infrared characterization of radome materials for accurate determination of microwave permittivity
Topic: Chemical Physics
Published: Date unknown
Authors: Karen M. Siegrist, David F Plusquellic, Michael E. Thomas
Abstract: Weak multiphonon bands dominate absorption at the lower absorption band edge which lies in the THz and submillimeter spectral regions for radome materials of interest. The strongly temperature dependent behavior of these bands extends into the microw ...

13. Multi-valued Versus Single-Valued Large-Amplitude Bending-Torsional-Rotational Coordinate Systems for Simultaneously Treating Trans-Bent and Cis-Bent Acetylene in its S1 State
Topic: Chemical Physics
Published: 7/28/2012
Author: Jon Torger Hougen
Abstract: There are now a large number of papers in the spectroscopic literature which make use of multiple-valued (frequently double-valued) coordinate systems and the associated multiple-groups of the permutation-inversion group to deal with the symmetry pro ...

14. Observation of the C2H2-N2O van der Waals Complex in the Overtone Range Using CW-CRDS
Topic: Chemical Physics
Published: 9/14/2009
Author: Walter Joseph Lafferty
Abstract: A slit nozzle supersonic expansion containing acetylene (0.246l/min) and nitrous oxide (0.355l/min) seeded into Ar (1.26l/min) is investigated using CW cavity ring down spectroscopy, in the 1.5 m range. The C2H2N2O van der Waals comp ...

15. On Walking in the Footprints of Giants
Topic: Chemical Physics
Published: 3/1/2010
Author: Marilyn E Jacox
Abstract: This chapter tells of a lifelong fascination with light, a messenger bearing information from realms ranging from the galactic to the submicroscopic. Personal interactions have shaped and informed this life journey. Accounts of some of the most imp ...

16. Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C60 Multilayer Films Assessed by Time-Resolved Terahertz Spectroscopy
Topic: Chemical Physics
Published: 10/1/2009
Authors: Okan Esenturk, Joseph S Melinger, Paul A. Lane, Edwin J Heilweil
Abstract: Alternating multi-layer and 1:1 blended films of zinc phthalocyanine (ZnPc)and buckminsterfullerene (C60) were investigated as model active layers for solar cells by Time-Resolved Terahertz Spectroscopy (TRTS). Relative photon-to-carrier efficiencies ...

17. Remarks on the Phase Change of the Electronic Wave Function Upon Going Once Around a Jahn-Teller Conical Intersection in Vibrational Coordinate Space
Topic: Chemical Physics
Published: 4/11/2013
Author: Jon Torger Hougen
Abstract: In this paper we revisit, with pedagogical emphasis for high-resolution spectroscopists, some presently existing discussions of phase factors for fixed-nuclei electronic wavefunctions in the Jahn-Teller problem. We give explicit examples, for a symm ...

18. Semiclassical fifth virial coefficients for improved ab initio helium-­4 standards
Topic: Chemical Physics
Published: 2/15/2012
Authors: Katherine Shaul, Andrew Schultz, David Kofke, Michael R Moldover
Abstract: For helium-4, we present ab initio, semi-classical calculations of virial coefficients Bn for for n = 2, 3, 4, and 5 from 50 K to 1000 K. Using our values of B4 and B5 and the more accurate literature values of B2 and B3, we argue that the ab initio ...

19. Shear Thinning Near the Critical Point of Xenon
Topic: Chemical Physics
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...

20. Strategies for Advanced Applications of Permutation-Inversion Groups to the Microwave Spectra of Molecules with Large Amplitude Motions
Topic: Chemical Physics
Published: 5/4/2009
Author: Jon Torger Hougen
Abstract: This article presents permutation-inversion group-theoretical strategies and recipes that will help a high-resolution molecular spectroscopist attempting to use the existing pedagogical literature to carry out their own treatment of the basic symmet ...

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