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  Direct Time-Domain Observation of Conformational Relaxation in Gas-Phase Cold Collisions

Drayna, G. K., Hallas, C., Wang, K., Domingos, S. R., Eibenberger, S., Doyle, J. M., et al. (2016). Direct Time-Domain Observation of Conformational Relaxation in Gas-Phase Cold Collisions. Angewandte Chemie International Edition, 55(16), 4957-4961. doi:10.1002/anie.201600030.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-55CA-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-55D2-3
Genre: Journal Article

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Locator:
http://dx.doi.org/10.1002/anie.201600030 (Publisher version)
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Locator:
http://arxiv.org/abs/1601.03359 (Preprint)
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 Creators:
Drayna, Garrett K.1, 2, Author
Hallas, Christian1, Author
Wang, Kenneth1, 2, Author
Domingos, Sérgio R.3, 4, Author              
Eibenberger, Sandra1, Author
Doyle, John M.1, Author
Patterson, David1, Author
Affiliations:
1Department of Physics, Harvard University, Cambridge, MA 02138 (USA), ou_persistent22              
2Department of Chemistry, Harvard University, Cambridge, MA 02138 (USA), ou_persistent22              
3Structure and Dynamics of Cold and Controlled Molecules, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938292              
4Center for Free-Electron Laser Science Notkestrasse 85, 22607 Hamburg (Germany), ou_persistent22              

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Free keywords: analytical chemistry; rotational spectroscopy; spectroscopic methods; time-resolved spectroscopy
 Abstract: Cooling molecules in the gas phase is important for precision spectroscopy, cold molecule physics, and physical chemistry. Measurements of conformational relaxation cross sections shed important light on potential energy surfaces and energy flow within a molecule. However, gas-phase conformational cooling has not been previously observed directly. In this work, we directly observe conformational dynamics of 1,2-propanediol in cold (6 K) collisions with atomic helium using microwave spectroscopy and buffer-gas cooling. Precise knowledge and control of the collisional environment in the buffer-gas allows us to measure the absolute collision cross-section for conformational relaxation. Several conformers of 1,2-propanediol are investigated and found to have relaxation cross-sections with He ranging from σ=4.7(3.0)×10−18 cm2 to σ>5×10−16 cm2. Our method is applicable to a broad class of molecules and could be used to provide information about the potential energy surfaces of previously uninvestigated molecules.

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Language(s): eng - English
 Dates: 2016-01-102016-03-152016-04-11
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/anie.201600030
arXiv: 1601.03359
 Degree: -

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Title: Angewandte Chemie International Edition
  Other : Angewandte Chemie, International Edition
  Abbreviation : Angew. Chem. Int. Ed.
Source Genre: Journal
 Creator(s):
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 55 (16) Sequence Number: - Start / End Page: 4957 - 4961 Identifier: ISSN: 1433-7851
CoNE: /journals/resource/1433-7851