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Development of a trans-rotational te...

Leiweke, Robert John.

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Development of a trans-rotational temperature diagnostic for vibrationally-excited carbon monoxide using single-photon laser-induced fluorescence.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Development of a trans-rotational temperature diagnostic for vibrationally-excited carbon monoxide using single-photon laser-induced fluorescence./
Author:	Leiweke, Robert John.
Description:	283 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1365.
Contained By:	Dissertation Abstracts International65-03B.
Subject:	Physics, Astronomy and Astrophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3124997

Development of a trans-rotational temperature diagnostic for vibrationally-excited carbon monoxide using single-photon laser-induced fluorescence.
Leiweke, Robert John.

Development of a trans-rotational temperature diagnostic for vibrationally-excited carbon monoxide using single-photon laser-induced fluorescence. - 283 p.

Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1365.

Thesis (Ph.D.)--The Ohio State University, 2004.

A new trans-rotational temperature diagnostic with +/-50K accuracy has been developed for use in nonequilibrium, low temperature, monatomic gases seeded with carbon monoxide (CO). The scheme utilizes single-photon laser induced fluorescence (LIF) of CO under vibrationally-excited conditions in which single-photon transitions from the CO X1Sigma + ground electronic state to upper electronic A1pi or D'1Sigma+ states become accessible to a tunable, narrowband ArF excimer laser at 193 nm. Two vibrationally excited environments in which the chemistry is well understood were used as a testbed; an optically-pumped 3% CO/Ar plasma at 100 torr and a 4% CO/He d.c. glow discharge at 8 torr. The LIF saturation limit was experimentally investigated and diagnostic advantages of either regime discussed. For the optically-pumped CO/Ar plasma, a spatially-averaged LIF temperature of 536 +/- 103 K (2sigma) was obtained from rotationally resolved X 1Sigma+ (v″ = 20) → D '1Sigma+ (v' = 2) LIF excitation spectra. Temperature measurements pumping the X 1Sigma+ (v″ = 7) → A 1pi (v' = 1) 4th Positive (528 +/- 51 K) were also found to compare well with line-of-sight Fourier Transform-InfraRed (FT-IR) emission measurements (536 +/- 10 K). Spatially averaged FT-IR spectroscopy of the CO 1st overtone was used to verify that an adequate vibrational population (&sim;0.1%) existed within the positive column of the CO/He d.c. glow discharge. The A-X (7,1) transition was pumped and subsequent (8,1) emission at 200.8 nm collected. The resulting rotational spectral peaks were assigned and a subset used to determine a spatially averaged rotational temperature of 432 +/- 44 K on the discharge centerline. This was found to be in good agreement with FT-IR spectroscopy measurements (395 +/- 10 K).Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

Development of a trans-rotational temperature diagnostic for vibrationally-excited carbon monoxide using single-photon laser-induced fluorescence.
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035 $a (UnM)AAI3124997
035 $a AAI3124997
040 $a UnM $c UnM
100 1 $a Leiweke, Robert John. $3 1900543
245 1 0 $a Development of a trans-rotational temperature diagnostic for vibrationally-excited carbon monoxide using single-photon laser-induced fluorescence.
300 $a 283 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1365.
500 $a Adviser: Walter R. Lempert.
502 $a Thesis (Ph.D.)--The Ohio State University, 2004.
520 $a A new trans-rotational temperature diagnostic with +/-50K accuracy has been developed for use in nonequilibrium, low temperature, monatomic gases seeded with carbon monoxide (CO). The scheme utilizes single-photon laser induced fluorescence (LIF) of CO under vibrationally-excited conditions in which single-photon transitions from the CO X1Sigma + ground electronic state to upper electronic A1pi or D'1Sigma+ states become accessible to a tunable, narrowband ArF excimer laser at 193 nm. Two vibrationally excited environments in which the chemistry is well understood were used as a testbed; an optically-pumped 3% CO/Ar plasma at 100 torr and a 4% CO/He d.c. glow discharge at 8 torr. The LIF saturation limit was experimentally investigated and diagnostic advantages of either regime discussed. For the optically-pumped CO/Ar plasma, a spatially-averaged LIF temperature of 536 +/- 103 K (2sigma) was obtained from rotationally resolved X 1Sigma+ (v″ = 20) → D '1Sigma+ (v' = 2) LIF excitation spectra. Temperature measurements pumping the X 1Sigma+ (v″ = 7) → A 1pi (v' = 1) 4th Positive (528 +/- 51 K) were also found to compare well with line-of-sight Fourier Transform-InfraRed (FT-IR) emission measurements (536 +/- 10 K). Spatially averaged FT-IR spectroscopy of the CO 1st overtone was used to verify that an adequate vibrational population (&sim;0.1%) existed within the positive column of the CO/He d.c. glow discharge. The A-X (7,1) transition was pumped and subsequent (8,1) emission at 200.8 nm collected. The resulting rotational spectral peaks were assigned and a subset used to determine a spatially averaged rotational temperature of 432 +/- 44 K on the discharge centerline. This was found to be in good agreement with FT-IR spectroscopy measurements (395 +/- 10 K).
520 $a As a prelude to Planar-LIF (PLIF) temperature measurements, vibrationally-resolved emission from laser excitation of various rotational lines within the A-X and D'-X bands were used to investigate spectral interferences. This information was used to determine that a simple aqueous organic filter (urea) in the A-X case, or commercial glass filter (UG-11) in the D '-X case, are adequate for rejecting elastically-scattered radiation and extraneous ro-vibrational bands during PLIF imaging.
520 $a Single-shot and accumulated PLIF images were obtained for the 3% CO/Ar optically pumped plasma. Using a Two-Line ratio method, A-X band Q-branch images were used to spatially resolve the trans-rotational temperature. While the single-shot precision, determined from four trials, was ≈+/-200 K (2sigma), the accuracy was ≈+/-100 K. The accuracy of PLIF results implied a systematic error which may be attributed to the ICCD camera having a slightly nonlinear response at the 50% gain setting.
590 $a School code: 0168.
650 4 $a Physics, Astronomy and Astrophysics. $3 1019521
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0606
690 $a 0759
690 $a 0538
690 $a 0548
710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 65-03B.
790 1 0 $a Lempert, Walter R., $e advisor
790 $a 0168
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3124997