Gas-phase diagnostic by time-resolved rotational coherent anti-Stokes Raman spectroscopy

2011 ◽  
Author(s):  
Thomas Seeger ◽  
A. Leipertz
Keyword(s):  
Raman Spectroscopy ◽  
Gas Phase ◽  
Time Resolved ◽  
Anti Stokes

Crossed Two-Beam Coherent Anti-Stokes Raman Spectroscopy in Dispersive Media

2003 ◽  
Vol 57 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Michael J. Papac ◽  
Jonathan D. Posner ◽  
Derek Dunn-Rankin
Keyword(s):  
Raman Spectroscopy ◽  
Gas Phase ◽  
Matching Condition ◽  
Laser Beams ◽  
Dispersive Media ◽  
Phase Matching ◽  
Optical Wave ◽  
Fitting Procedure ◽  
Phase Matching Condition ◽  
Anti Stokes

Coherent anti-Stokes Raman spectroscopy (CARS) is a nonlinear optical wave mixing process that is used in gas-phase systems to determine the energy distribution of the probed species (usually N2) and, through a fitting procedure, the temperature giving rise to it. CARS signal strengths are maximized when the phase matching condition is met. Because gases are generally non-dispersive, this phase matching condition can be found geometrically as a function of the crossing angles between the CARS beams and their wavelengths. In addition, perfect phase matching in non-dispersive media occurs automatically for collinear beams. To improve spatial resolution, however, intersecting the laser beams is desirable. Being a third-order process, phase matching for CARS in gases typically requires three input laser beams. This paper discusses and demonstrates the issues of phase matching for CARS when the medium is dispersive, and the ability for CARS phase matching to occur with only two crossed laser beams (one pump and one probe). This two-beam X-CARS in dispersive media can be used as an alignment tool for gas-phase CARS and may be relevant as a simpler diagnostic in high-pressure environments. The paper also discusses the effects of non-ideal phase matching in dispersive and non-dispersive media.

scholarly journals New Trends in Raman Spectroscopy: From High-Resolution Geochemistry to Planetary Exploration

Elements ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 117-122 ◽  
Author(s):  
Olivier Beyssac
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Raman Signal ◽  
Time Resolved ◽  
The Earth ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Anti Stokes ◽  
Near Future ◽  
Very High

This article reviews nonconventional Raman spectroscopy techniques and discusses present and future applications of these techniques in the Earth and planetary sciences. Time-resolved spectroscopy opens new ways to limit or exploit luminescence effects, whereas techniques based on coherent anti-Stokes Raman scattering (CARS) or surface-enhanced Raman spectroscopy (SERS) allow the Raman signal to be considerably enhanced even down to very high spatial resolutions. In addition, compact portable Raman spectrometers are now routinely used out of the laboratory and are even integrated to two rovers going to Mars in the near future.

Picosecond time-resolved pure-rotational coherent anti-Stokes Raman spectroscopy in sooting flames

2011 ◽  
Vol 33 (1) ◽  
pp. 831-838 ◽  
Author(s):  
Christopher J. Kliewer ◽  
Yi Gao ◽  
Thomas Seeger ◽  
Johannes Kiefer ◽  
Brian D. Patterson ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Time Resolved ◽  
Anti Stokes

scholarly journals Femtosecond time resolved coherent anti-Stokes Raman spectroscopy of H2–N2 mixtures in the Dicke regime: Experiments and modeling of velocity effects

2009 ◽  
Vol 131 (17) ◽  
pp. 174310 ◽  
Author(s):  
H. Tran ◽  
F. Chaussard ◽  
N. Le Cong ◽  
B. Lavorel ◽  
O. Faucher ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Time Resolved ◽  
Anti Stokes

Molecular dynamics in low vibrational states investigated by fs time-resolved coherent anti-Stokes Raman spectroscopy technique

2011 ◽  
Vol 284 (19) ◽  
pp. 4677-4682 ◽  
Author(s):  
Ping He ◽  
Sining Li ◽  
Rongwei Fan ◽  
Yuanqin Xia ◽  
Xin Yu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Raman Spectroscopy ◽  
Spectroscopy Technique ◽  
Vibrational States ◽  
Time Resolved ◽  
Anti Stokes
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