LASER-BASED DIAGNOSTIC FOR N2(X V)

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$200,000.00
Award Year:
1987
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
4256
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Physical Sciences, Inc.
Po Box 3100 - Research Pk, Andover, MA, 01810
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
William J Marinelli
(617) 475-9030
Business Contact:
() -
Research Institution:
n/a
Abstract
WE PROPOSE TO DEVELOP TWO LASER-BASED TECHNIQUES TO MONITOR POPULATIONS OF HIGHLY VIBRATIONALLY EXCITED GROUND ELECTRONIC STATE N(2)(X,V>>0) IN A CHEMICAL LASER ENVIRONMENT. THE TECHNIQUES ARE NON-INTRUSIVE POINT DIAGNOSTICS WITH POTENTIAL DETECTION SENSITIVITIES AS LOW AS 10(12) MOLECULES CM -3. ONE TECHNIQUE INVOLVES THE USE OF MULTIPHOTON IONIZATION SPECTROSCOPY (MPI) TO IONIZE N2(X,V) WITH FOUR PHOTONS FROM A TUNABLE LADER USING THE A(1)PIG STATE AT THE TWO-PHOTON LEVEL. IONS FORMED IN THE GAS STREAM WILL BE COLLECTED USING BIASED ELECTRODES. THE SECOND TECHNIQUE EMPLOYS AN OPTICAL DOUBLE-RESONANCE METHOD TO EXCITE N(2)(X,V) TO N(2)(B,V) USING THE N(2)(A) STATE AS AN INTERMEDIATE. FLUORESCENCE FROM N(2)(B) WILL BE DETECTED AS A MEASURE OF N(2)(X,V). THE TECHNIQUES WILL BE CALIBRATED USING THE HE-METASTABLE PENNING IONIZATION TECHNIQUE IN CONJUNCTION WITH KINETIC MODELING. POTENTIAL INTERFERENCES FROM OTHER SPECIES POTENTIALLY PRESENT IN AN INTERHALOGEN TRANSFER LASER WILL BE EXPERIMENTALLY EVALUATED. N(2)(X,V) WILL BE PREPARED BY DISCHARGING N(2)/AR MIXTURES IN A DISCHARGE FLOW REACTOR CURRENTLY IN OPERATION AT PSI. A TANDEM UV-VISIBLE ND:YAG PUMPED DYE LASER SYSTEM WILL BE USED AS THE LASER PROBE SOURCE.

* information listed above is at the time of submission.

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