Damped and thermal motion of large, laser-aligned molecules in droplet beams

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We consider a monodispersed Rayleigh droplet beam of water droplets doped with proteins. An intense infrared laser is used to align these droplets. The arrangement has been proposed for electron and X-ray diffraction studies of proteins which are difficult to crystallize. This paper considers the effect of thermal fluctuations on the angular spread of alignment in thermal equilibrium, and relaxation phenomena, particularly the damping of oscillations excited as the molecules enter the field. The possibility of adiabatic alignment is also considered. We find that damping times in high pressure gas cell as used in X-ray diffraction experiments are short compared ... continued below

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Starodub, D; Doak, B; Schmidt, K; Weierstall, U; Wu, J; Spence, J et al. September 29, 2005.

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We consider a monodispersed Rayleigh droplet beam of water droplets doped with proteins. An intense infrared laser is used to align these droplets. The arrangement has been proposed for electron and X-ray diffraction studies of proteins which are difficult to crystallize. This paper considers the effect of thermal fluctuations on the angular spread of alignment in thermal equilibrium, and relaxation phenomena, particularly the damping of oscillations excited as the molecules enter the field. The possibility of adiabatic alignment is also considered. We find that damping times in high pressure gas cell as used in X-ray diffraction experiments are short compared to the time taken for molecules to traverse the beam, and that a suitably shaped field might be used for electron diffraction experiments in vacuum to provide adiabatic alignment, thus obviating the need for a damping gas cell.

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PDF-file: 26 pages; size: 0 Kbytes

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  • Journal Name: Journal of Chemical Physics; Journal Volume: 123

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  • Report No.: UCRL-JRNL-215872
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 885358
  • Archival Resource Key: ark:/67531/metadc892944

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  • September 29, 2005

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  • Sept. 23, 2016, 2:42 p.m.

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  • Dec. 5, 2016, 1:29 p.m.

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Starodub, D; Doak, B; Schmidt, K; Weierstall, U; Wu, J; Spence, J et al. Damped and thermal motion of large, laser-aligned molecules in droplet beams, article, September 29, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc892944/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.