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Applied Physics Letters / Volume 97 / Issue 8 / LASERS, OPTICS, AND OPTOELECTRONICS
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Appl. Phys. Lett. 97, 081112 (2010); http://dx.doi.org/10.1063/1.3483871 (3 pages)

Direct measurement of rotationally resolved H2 Q-branch Raman coherence lifetimes using time-resolved picosecond coherent anti-Stokes Raman scattering

Waruna D. Kulatilaka1, Paul S. Hsu1, Hans U. Stauffer1, James R. Gord2, and Sukesh Roy1

1Spectral Energies, LLC, 5100 Springfield Street, Suite 301, Dayton, Ohio 45431, USA
2Air Force Research Laboratory, Propulsion Directorate, Wright-Patterson AFB, Ohio 45433, USA

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(Received 12 July 2010; accepted 9 August 2010; published online 26 August 2010)

We report direct measurement of H2 Q-branch Raman coherence lifetimes using time-resolved picosecond coherent anti-Stokes Raman scattering (ps-CARS). A custom-built, high-peak-power, nearly transform-limited ps laser system offers an ideal combination of frequency and temporal resolution for such measurements. The coherence lifetimes measured for pure H2 at room temperature are in good agreement with decay rates that were derived from previous high-resolution studies. Measurements were also performed in binary mixtures of H2–X (X = Ar, N2, CH4, and C2H4). These measurements can be useful for accurate H2 ps-CARS thermometry as well as for studying various H2 collisional energy-transfer processes.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

coherent antiStokes Raman scattering, organic compounds, temperature measurement, time resolved spectroscopy

PACS

  • 78.47.je

    Time resolved light scattering spectroscopy

  • 78.30.-j

    Infrared and Raman spectra

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3483871

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (2) Tables (2)

Figures (click on thumbnails to view enlargements)

FIG.1
(a) H2 ps-CARS spectra shown for three different probe time delays at P = 1 bar and T = 294 K; (b) ps-CARS signals integrated over individual rotational lines as a function of probe time delay together with single-exponential fits (solid lines) to the decay.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Coherence dephasing time constants, τCARS,J, of the first four Q-branch lines of pure H2 at 294 K as a function of pressure. The symbols denote the experimental measurements, and the solid lines are theoretical values calculated using Eqs. ( 1 , 2 ).

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Tables

Table I. Comparison of best-fit values for D0 (in units of cm2 amagat/s) and γ0−γ3 (in units of 10−3 cm−1/amagat) for pure H2 at T = 294 K. Values in parentheses represent estimated 2σ errors [Skenderović et al. (Ref. 7) report “estimated errors” rather than 2σ errors] in the last digit of the reported least-squares fit value.

View Table
Table II. Best-fit values of D0 (in units of cm2 amagat/s) and γ0−γ3 (in units of 10−3 cm−1/amagat) determined for a pressure range of 0.6–10 bar for various binary mixtures containing H2 at 294 K; percent values represent percent by volume of denoted gas. Values in parentheses represent estimated 2σ errors in the last digit of the reported least-squares fit value.

View Table


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