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June 19, 2017 Justin Young, - PowerPoint Presentation

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June 19, 2017 Justin Young, - PPT Presentation

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

phys chem water fluorescent chem phys fluorescent water results 121 fluorescence lee harich 2000 113 10073 rydberg 2012 1964

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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.

Slide2

Chemistry in Space:

Emerging Satellite Applications

~

36,000km

Lyman-

(121.6nm)

 

Slide3

Water Photodynamics

Harich

et al.

 

J. Chem. Phys

2000

, 113, 10073

.

Slide4

OH + 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

Slide6

Apparatus

Slide7

Fluorescence Spectrum

Slide8

Water Excitation, OH

Emission

Experiment

Simulation

Slide9

H-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.

Slide10

Water Excitation, OH Emission

Experiment

Simulation

Slide11

Water Excitation, OH

Emission

H-Rydberg results*

τ

rad

/

τ

tot

2

Φ

fluorescent = 0.69ΦOH(A)

Fluorescent resultsΦfluorescent =

0.67ΦOH(A)

Slide12

+

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.

Slide14

Jet-Cooling

Slide15

Jet-Cooling

Slide16

Zachry

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

Slide17

Questions