Picosecond calorimetry : time-resolved x-ray diffraction studies of liquid CH2Cl2
(2006) In Journal of Chemical Physics 124(23). p.1-9- Abstract
Liquid phase time-resolved x-ray diffraction with 100 ps resolution has recently emerged as a powerful technique for probing the structural dynamics of transient photochemical species in solution. It is intrinsic to the method, however, that a structural signal is observed not only from the photochemical of interest but also from the embedding solvent matrix. To experimentally characterize the x-ray diffraction signal deriving from the solvent alone we performed time-resolved diffraction studies of a pure liquid sample over a time domain from -250 ps to 2.5 micros. Multiphoton excitation was used to rapidly heat liquid CH(2)Cl(2) using UV pulses of 100 fs duration. A significant x-ray diffraction signal is visible prior to the onset of... (More)
Liquid phase time-resolved x-ray diffraction with 100 ps resolution has recently emerged as a powerful technique for probing the structural dynamics of transient photochemical species in solution. It is intrinsic to the method, however, that a structural signal is observed not only from the photochemical of interest but also from the embedding solvent matrix. To experimentally characterize the x-ray diffraction signal deriving from the solvent alone we performed time-resolved diffraction studies of a pure liquid sample over a time domain from -250 ps to 2.5 micros. Multiphoton excitation was used to rapidly heat liquid CH(2)Cl(2) using UV pulses of 100 fs duration. A significant x-ray diffraction signal is visible prior to the onset of thermal expansion, which characterizes a highly compressed superheated liquid. Liquid CH(2)Cl(2) then expands as a shock wave propagates through the sample and the temporal dependence of this phenomenon is in good agreement with theory. An unexpectedly slow initial release of energy into the liquid as heat is observed from multiphoton excited CH(2)Cl(2), revealing the presence of a metastable state of multiphoton excited CH(2)Cl(2).
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- author
- Georgiou, Panayiotis ; Vincent, Jonathan ; Andersson, Magnus ; Wöhri, Annemarie B ; Gourdon, Pontus LU ; Poulsen, Jens ; Davidsson, Jan and Neutze, Richard
- publishing date
- 2006-06-21
- type
- Contribution to journal
- publication status
- published
- keywords
- Journal Article
- in
- Journal of Chemical Physics
- volume
- 124
- issue
- 23
- article number
- 234507
- pages
- 1 - 9
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- pmid:16821929
- scopus:33745304378
- ISSN
- 0021-9606
- DOI
- 10.1063/1.2205365
- language
- English
- LU publication?
- no
- id
- 5ad87af5-129e-45fd-8189-8275668da436
- date added to LUP
- 2017-04-29 15:32:43
- date last changed
- 2024-01-28 17:04:41
@article{5ad87af5-129e-45fd-8189-8275668da436, abstract = {{<p>Liquid phase time-resolved x-ray diffraction with 100 ps resolution has recently emerged as a powerful technique for probing the structural dynamics of transient photochemical species in solution. It is intrinsic to the method, however, that a structural signal is observed not only from the photochemical of interest but also from the embedding solvent matrix. To experimentally characterize the x-ray diffraction signal deriving from the solvent alone we performed time-resolved diffraction studies of a pure liquid sample over a time domain from -250 ps to 2.5 micros. Multiphoton excitation was used to rapidly heat liquid CH(2)Cl(2) using UV pulses of 100 fs duration. A significant x-ray diffraction signal is visible prior to the onset of thermal expansion, which characterizes a highly compressed superheated liquid. Liquid CH(2)Cl(2) then expands as a shock wave propagates through the sample and the temporal dependence of this phenomenon is in good agreement with theory. An unexpectedly slow initial release of energy into the liquid as heat is observed from multiphoton excited CH(2)Cl(2), revealing the presence of a metastable state of multiphoton excited CH(2)Cl(2).</p>}}, author = {{Georgiou, Panayiotis and Vincent, Jonathan and Andersson, Magnus and Wöhri, Annemarie B and Gourdon, Pontus and Poulsen, Jens and Davidsson, Jan and Neutze, Richard}}, issn = {{0021-9606}}, keywords = {{Journal Article}}, language = {{eng}}, month = {{06}}, number = {{23}}, pages = {{1--9}}, publisher = {{American Institute of Physics (AIP)}}, series = {{Journal of Chemical Physics}}, title = {{Picosecond calorimetry : time-resolved x-ray diffraction studies of liquid CH2Cl2}}, url = {{http://dx.doi.org/10.1063/1.2205365}}, doi = {{10.1063/1.2205365}}, volume = {{124}}, year = {{2006}}, }