B. Lavorel,1
L. Guillot,1
J. Bonamy,2
and D. Robert2
1Laboratoire de Physique de l’Université de Bourgogne, Unité de Recherche Associée au Centre National de la Recherche Scientifique 1796, Université de Bourgogne, 6 Boulevard Gabriel, 21100 Dijon, France
2Laboratoire de Physique Moléculaire, Unité de Recherche Associée au Centre National de la Recherche Scientifique 772, Université de Franche-Comté, 25030 Besançon Cedex, France
B. Lavorel, L. Guillot, J. Bonamy, and D. Robert, "Collisional Raman linewidths of nitrogen at high temperature (1700–2400 K)," Opt. Lett. 20, 1189-1191 (1995)
New high-temperature measurements of collisional linewidths of the Raman Q branch of nitrogen have been performed at 1700–2400 K with stimulated Raman spectroscopy in a tungsten filament. We fitted these data together with previous data obtained in the 295–1500-K range to redetermine the parameters of the relaxation models used in coherent anti-Stokes Raman spectroscopy thermometry. The improvement in the accuracy of the temperature measurement has been checked. Semiclassical calculations of linewidths in the 1700–2400-K range agree with the experimental data and have been extended to even higher temperatures.
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Values are expressed in units of 10−3 cm−1 atm−1.
Values in parentheses are three times the standard deviation.
Only semiclassical values are given here.
Alpha is expressed in units of 10−3 cm−1 atm−1; values in parentheses are one standard deviation.
Calculated with previous linewidth data and the (T/T0)−N temperature factor.
Calculated with previous data and the new high-temperature (HT) experimental data.
Calculated with previous and new HT data and the (T/T0)−0.5 [1−exp(−m)]/[1−exp(mT/T0)] temperature factor.
Similar to column III but also includes the semiclassical values at 2700 and 3000 K (T0 = 295 K).
Table 3
Temperatures Deduced from the Set of MEG Parameters Given in Table 2 Compared with Those of the Pyrometer a
Values are expressed in units of 10−3 cm−1 atm−1.
Values in parentheses are three times the standard deviation.
Only semiclassical values are given here.
Alpha is expressed in units of 10−3 cm−1 atm−1; values in parentheses are one standard deviation.
Calculated with previous linewidth data and the (T/T0)−N temperature factor.
Calculated with previous data and the new high-temperature (HT) experimental data.
Calculated with previous and new HT data and the (T/T0)−0.5 [1−exp(−m)]/[1−exp(mT/T0)] temperature factor.
Similar to column III but also includes the semiclassical values at 2700 and 3000 K (T0 = 295 K).
Table 3
Temperatures Deduced from the Set of MEG Parameters Given in Table 2 Compared with Those of the Pyrometer a
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