Study of the first Stokes line of Raman cell full of CH4, H2, D2 and their mixture with Ar,He gases

2005 ◽  
Author(s):  
Zongming Tao ◽  
Yinchao Zhang ◽  
Kaifa Cao ◽  
Shihua Yu ◽  
Xin Fang ◽  
...  
Keyword(s):  
Stokes Line ◽  
Raman Cell

Spectral modification of the Stokes line of a Raman-coupled three-level system in a cavity

1992 ◽  
Vol 45 (3) ◽  
pp. 1843-1846 ◽  
Author(s):  
Gautam Gangopadhyay ◽  
Deb Shankar Ray
Keyword(s):  
Stokes Line ◽  
Level System ◽  
Spectral Modification

Variable Temperature Raman Cell

1971 ◽  
pp. 265-272
Author(s):  
D. J. Antion ◽  
J. R. Durig
Keyword(s):  
Variable Temperature ◽  
Raman Cell

2.—Barriers bounded by Two Transition Points of Arbitrary Odd Order

1975 ◽  
Vol 73 ◽  
pp. 51-64 ◽  
Author(s):  
John Heading
Keyword(s):  
Approximate Solutions ◽  
Stokes Line ◽  
Reflection And Transmission ◽  
Dominant Term ◽  
Transmission Coefficients ◽  
Odd Order ◽  
Inherent Error ◽  
Error Terms ◽  
Transition Points ◽  
Made In

SynopsisA generalisation is considered of the potential barrier problem beyond the familiar case in which the barrier is bounded by transition points of order one. Here, the two transition points involved are of arbitrary odd order. The approximate method employed, though formal in character, avoids certain pitfalls often made in the past whereby certain exponentially small terms within the barrier are confounded with inherent error terms. This confusion is avoided in the treatment given here by tracing uniformly approximate solutions round the transition points in the complex plane by means of the Stokes phenomenon, the method not requiring the dubious concept of a subdominant term existing in the presence of a dominant term on a Stokes line. At the same time, the solutions to which the reflection and transmission coefficients may be attached are carefully discussed, so that the appearance of a small exponential term may be seen to be genuine when taken in conjunction with inherent error terms. The resulting formula for the modulus of the reflection coefficient generalizes the more elementary formula.

UV ozone DIAL based on a Raman cell filled with two Raman active gases

1999 ◽  
Author(s):  
Valentin Simeonov ◽  
Benoit Lazzarotto ◽  
Gilles Larcheveque ◽  
Philippe Quaglia ◽  
Bertrand Calpini
Keyword(s):  
Raman Cell ◽  
Uv Ozone

scholarly journals Exponential asymptotics and Stokes lines in a partial differential equation

2005 ◽  
Vol 461 (2060) ◽  
pp. 2385-2421 ◽  
Author(s):  
S. Jonathan Chapman ◽  
David B Mortimer
Keyword(s):  
Differential Equation ◽  
Partial Differential Equation ◽  
Second Generation ◽  
Saddle Points ◽  
Asymptotic Series ◽  
Perturbation Expansion ◽  
Higher Order ◽  
Stokes Line ◽  
Partial Differential ◽  
Stokes Lines

A singularly perturbed linear partial differential equation motivated by the geometrical model for crystal growth is considered. A steepest descent analysis of the Fourier transform solution identifies asymptotic contributions from saddle points, end points and poles, and the Stokes lines across which these may be switched on and off. These results are then derived directly from the equation by optimally truncating the naïve perturbation expansion and smoothing the Stokes discontinuities. The analysis reveals two new types of Stokes switching: a higher-order Stokes line which is a Stokes line in the approximation of the late terms of the asymptotic series, and which switches on or off Stokes lines themselves; and a second-generation Stokes line, in which a subdominant exponential switched on at a primary Stokes line is itself responsible for switching on another smaller exponential. The ‘new’ Stokes lines discussed by Berk et al . (Berk et al . 1982 J. Math. Phys. 23 , 988–1002) are second-generation Stokes lines, while the ‘vanishing’ Stokes lines discussed by Aoki et al . (Aoki et al . 1998 In Microlocal analysis and complex Fourier analysis (ed. K. F. T. Kawai), pp. 165–176) are switched off by a higher-order Stokes line.

A Raman Cell for Low Temperature Liquids

1974 ◽  
Vol 28 (2) ◽  
pp. 194-195 ◽  
Author(s):  
Chris W. Brown ◽  
Alfred G. Hopkins ◽  
Francis P. Daly
Keyword(s):  
Low Temperature ◽  
Raman Cell

A micro‐Raman cell for studying aqueous solutions at high temperatures and pressures

1993 ◽  
Vol 64 (7) ◽  
pp. 1994-1998 ◽  
Author(s):  
Donald A. Palmer ◽  
G. M. Begun ◽  
F. H. Ward
Keyword(s):  
Aqueous Solutions ◽  
High Temperatures ◽  
Raman Cell

Localized High-Resolution Stress Measurements on MEMS Structures

2009 ◽  
Author(s):  
Dietmar Vogel ◽  
Astrid Gollhardt ◽  
Bernd Michel
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Spatial Resolution ◽  
Focused Ion Beam ◽  
Stress Measurement ◽  
Ion Beam ◽  
Stress Relief ◽  
Stokes Line ◽  
Stress Measurements ◽  
Electron Backscattering

Three different methods of stress measurement with strong spatial resolution are presented. They base on stress relief techniques caused by focused ion beam milling, on altered electron backscattering by deformed lattices and on Stokes line shift measurements by Raman spectroscopy. The capability of these methods is demonstrated by their application to typical MEMS structures. A comparison between the methods is performed in order to outline potentials and limitations.

scholarly journals Lower-free tropospheric ozone dial measurements over Athens, Greece

2018 ◽  
Vol 176 ◽  
pp. 05025 ◽  
Author(s):  
Michail Mytilinaios ◽  
Alexandros Papayannis ◽  
Georgios Tsaknakis
Keyword(s):  
Remote Sensing ◽  
Boundary Layer ◽  
Tropospheric Ozone ◽  
Vertical Profile ◽  
Stimulated Raman Scattering ◽  
Laser Wavelength ◽  
Free Troposphere ◽  
Differential Absorption ◽  
Raman Cell ◽  
Laser Remote Sensing

A compact ozone differential absorption lidar (DIAL) was implemented at the Laboratory of Laser Remote Sensing of the National Technical University of Athens (NTUA), in Athens, Greece. The DIAL system is based on a Nd:YAG laser emitting at 266 nm. A high-pressure Raman cell, filled with D2, was used to generate the λON and λOFF laser wavelength pairs (i.e., 266-289 nm and 289-316 nm, respectively) based on the Stimulated Raman Scattering (SRS) effect. The system was run during daytime and nighttime conditions to obtain the vertical profile of tropospheric ozone in the Planetary Boundary Layer (PBL) and the adjacent free troposphere.

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