Christopher Annesley Jaime Stearns Space Vehicles Directorate Air Force Research Labs QUANTIFICATION OF FLUORESCENCE FROM THE LYMANALPHA PHOTOLYSIS OF WATER FOR SPACECRAFT PLUME CHARACTERIZATION ID: 815323
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Slide1
June 19, 2017
Justin Young, Christopher Annesley, Jaime StearnsSpace Vehicles DirectorateAir Force Research Labs
QUANTIFICATION OF FLUORESCENCE FROM THE LYMAN-ALPHA PHOTOLYSIS OF WATER FOR SPACECRAFT PLUME CHARACTERIZATION.
Slide2Chemistry in Space:
Emerging Satellite Applications
~
36,000km
Lyman-
(121.6nm)
Water Photodynamics
Harich
et al.
J. Chem. Phys
2000
, 113, 10073
.
Slide4OH + 310 nm
OH(A, low N)
H
2
O + 121.6 nm
OH(A, high v,N)
H
2
O + 103 nm
OH(A, very high
v,N
)
Shuttle PlumeSpectra Components
Shuttle Plume
L. S. Bernstein,
et al., J. Phys. Chem. A. 107 (49), 10695-10705 (2003).
Slide5+
121.6 nm
Φ
molecular
Φ
fluorescence
13
1
, 14%
2
4-7
3
,5
4
, 8%
5,6
66%
1
21%
1
NA
1
1
Harich
et al.
J. Chem. Phys.
2000
, 113, 10073
.
2
D
. H.
Mordaunt
, et al. J. Chem. Phys.
1994,
100,
7360.
3
Dutuit
, O
et al.
J. Chem. Phys.
1985
, 83, 584.
4
Carrington
., T.
J.
Chem
Phys.
1964
, 41, 2012.
5 Lee, L. C., Suto, M. Chem. Phys. 1986, 110, 161.6 Lee, L. C., J. Chem. Phys. 1980, 72 4334-4340.
Dissociation of Water
Slide6Apparatus
Slide7Fluorescence Spectrum
Slide8Water Excitation, OH
Emission
Experiment
Simulation
Slide9H-Atom Rydberg Tagging
H
2
O(B)→OH(X)+H
OH(A)+H
O(P) + 2H
O(D)+H2
Quantify Branching ratios
Experiment
Results
Harich
, S. A.; Hwang, D. W. H.; Yang, X.; Lin, J. J.; Yang, X.; Dixon, R., J. Chem. Phys.
2000, 113, 10073-10090.
Slide10Water Excitation, OH Emission
Experiment
Simulation
Slide11Water Excitation, OH
Emission
H-Rydberg results*
τ
rad
/
τ
tot
2
Φ
fluorescent = 0.69ΦOH(A)
Fluorescent resultsΦfluorescent =
0.67ΦOH(A)
+
121.6 nm
Φ
molecular
Φ
fluorescence
13
1
, 14%
2
4-7
3
,5
4
, 8%
5,6
66%
1
21%
1
NA
1
1
Harich
et al.
J. Chem. Phys.
2000
, 113, 10073
.
2
D
. H.
Mordaunt
, et al. J. Chem. Phys.
1994,
100,
7360.
3
Dutuit
, O
et al.
J. Chem. Phys.
1985
, 83, 584.
4
Carrington
., T.
J.
Chem
Phys.
1964
, 41, 2012.
5 Lee, L. C., Suto, M. Chem. Phys. 1986, 110, 161.6 Lee, L. C., J. Chem. Phys. 1980, 72 4334-4340.
Dissociation of Water
H-Rydberg results*
τ
rad
/
τ
tot
2
Fluorescent results
Φ
fluorescent
=
0.69
Φ
OH(A)
Φ
fluorescent
=
0.67
Φ
OH(A)
Φ
fluorescent
=
9.0
Φ
fluorescent
=
8.7
Slide13+
121.6 nm
Dissociation of Water
H-Rydberg results*
τ
rad
/
τ
tot
2
Fluorescent results
Φ
fluorescent
=
0.69
Φ
OH(A)
Φ
fluorescent
=
0.67
Φ
OH(A)
Φ
fluorescent
=
9.0
Φ
fluorescent
=
8.7
Φ
molecular
Φ
fluorescence
13
1
, 14%
2
4-7
3
,5
4
, 8%
5
66%
1
21%
1
NA
1
1
Harich
et al.
J. Chem. Phys.
2000
, 113, 10073
.
2
D
. H.
Mordaunt
, et al. J. Chem. Phys.
1994,
100,
7360.
3
Dutuit
, O
et al.
J. Chem. Phys.
1985
, 83, 584.
4
Carrington
., T.
J.
Chem
Phys.
1964
, 41, 2012.
5
Lee
, L. C
.,
Suto
, M.
Chem. Phys.
1986
,
110
, 161.
Slide14Jet-Cooling
Slide15Jet-Cooling
Slide16Zachry
Theis
(SS), Dr. Ryan Booth (BC), Dr. Chris
Annesley,
Dr. Justin Young (BC)
Morgan Norton (SS), Dr. Jaime Stearns, Dr. Kristen (
Vogelhuber
) Lemke (BC),
Dr. Amanda Patrick (not pictured, NRC)
Laser Spectroscopy and Reactivity (LaSR) Lab
Slide17Questions