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Low temperature helium pressure broa...

Ronningen, Theodore J.

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Low temperature helium pressure broadening of hydrogen carbon nitride.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Low temperature helium pressure broadening of hydrogen carbon nitride./
Author:	Ronningen, Theodore J.
Description:	233 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3200.
Contained By:	Dissertation Abstracts International66-06B.
Subject:	Physics, Molecular. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3177142
ISBN:	9780542196263

Low temperature helium pressure broadening of hydrogen carbon nitride.
Ronningen, Theodore J.

Low temperature helium pressure broadening of hydrogen carbon nitride. - 233 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3200.

Thesis (Ph.D.)--The Ohio State University, 2005.

We measured the helium induced pressure broadening and shifting of the distinct hyperfine components of the j = 1 ← 0 and j = 2 ← 1 transitions of HC14N at temperatures between 1.3 and 18 K. The HCN molecules were cooled to these temperatures using the collisional cooling technique. As a test that this cooling technique was generating the cold samples expected, we measured the Doppler contribution to the spectral lines, and these measurements confirmed that the molecules were at the same temperature as the walls of the spectroscopic cell. We observed that the hyperfine components of the 2 ← 1 transition have distinct broadening coefficients that differ from one another by as much as 5%. The measured differences are in reasonable agreement with theoretical predictions. We also performed molecular scattering calculations, using three proposed He-HCN potential energy surfaces, in order to compare our pressure broadening and shifting results with theoretical predictions. The predictions were within a few standard deviations near 18 K, but at the lowest experimental temperatures the predictions were many standard deviations larger than the measured values. This discrepancy is similar to a discrepancy found in two previous low temperature pressure broadening studies, and this dissertation discusses possible experimental and theoretical origins for this persistent discrepancy.

ISBN: 9780542196263Subjects--Topical Terms:

1018648
Physics, Molecular.

Low temperature helium pressure broadening of hydrogen carbon nitride.
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020 $a 9780542196263
035 $a (UnM)AAI3177142
035 $a AAI3177142
040 $a UnM $c UnM
100 1 $a Ronningen, Theodore J. $3 1913052
245 1 0 $a Low temperature helium pressure broadening of hydrogen carbon nitride.
300 $a 233 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3200.
500 $a Adviser: Frank C. De Lucia.
502 $a Thesis (Ph.D.)--The Ohio State University, 2005.
520 $a We measured the helium induced pressure broadening and shifting of the distinct hyperfine components of the j = 1 ← 0 and j = 2 ← 1 transitions of HC14N at temperatures between 1.3 and 18 K. The HCN molecules were cooled to these temperatures using the collisional cooling technique. As a test that this cooling technique was generating the cold samples expected, we measured the Doppler contribution to the spectral lines, and these measurements confirmed that the molecules were at the same temperature as the walls of the spectroscopic cell. We observed that the hyperfine components of the 2 ← 1 transition have distinct broadening coefficients that differ from one another by as much as 5%. The measured differences are in reasonable agreement with theoretical predictions. We also performed molecular scattering calculations, using three proposed He-HCN potential energy surfaces, in order to compare our pressure broadening and shifting results with theoretical predictions. The predictions were within a few standard deviations near 18 K, but at the lowest experimental temperatures the predictions were many standard deviations larger than the measured values. This discrepancy is similar to a discrepancy found in two previous low temperature pressure broadening studies, and this dissertation discusses possible experimental and theoretical origins for this persistent discrepancy.
590 $a School code: 0168.
650 4 $a Physics, Molecular. $3 1018648
650 4 $a Chemistry, Physical. $3 560527
690 $a 0609
690 $a 0494
710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 66-06B.
790 1 0 $a De Lucia, Frank C., $e advisor
790 $a 0168
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3177142