Air Force Research Laboratory QUANTIFICATION OF FLUORESCENCE FROM

Air Force Research Laboratory QUANTIFICATION OF FLUORESCENCE FROM THE LYMAN-ALPHA PHOTOLYSIS OF WATER FOR SPACECRAFT PLUME CHARACTERIZATION. June 19, 2017 Justin Young, Christopher Annesley, Jaime Stearns Integrity Service Excellence Space Vehicles Directorate Air Force Research Labs

Chemistry in Space: Emerging Satellite Applications ~36, 000 km 2

Water Photodynamics Harich et al. J. Chem. Phys 2000, 113, 10073. 3

Shuttle Plume Spectra Components 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) L. S. Bernstein, et al. , J. Phys. Chem. A. 107 (49), 10695 -10705 (2003). 4

Dissociation of Water Φmolecular Φfluorescence 131, 14%2 4 -73, 54, 8%5, 6 66%1 21%1 NA 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. 1 5

Apparatus 6

Fluorescence Spectrum 7

Water Excitation, OH Emission Experiment Simulation 8

H-Atom Rydberg Tagging Experiment Results Quantify Branching ratios H 2 O(B)→OH(X)+H OH(A)+H O(P) + 2 H O(D)+H 2 1) Harich, S. A. ; Hwang, D. W. H. ; Yang, X. ; Lin, J. J. ; Yang, X. ; Dixon, R. , J. Chem. Phys. 2000, 113, 10073 -10090. 9

Water Excitation, OH Emission Experiment Simulation 10

Water Excitation, OH Emission H-Rydberg results*τrad/τtot 2 Φfluorescent = 0. 69ΦOH(A) Fluorescent results Φfluorescent = 0. 67ΦOH(A) 11

Dissociation of Water Φmolecular Φfluorescence 131, 14%2 4 -73, 54, 8%5, 6 66%1 21%1 NA 1 H-Rydberg results*τrad/τtot 2 Φfluorescent = 0. 69ΦOH(A) Φfluorescent = 9. 0 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. Fluorescent results Φfluorescent = 0. 67ΦOH(A) Φfluorescent = 8. 7 1 12

Dissociation of Water Φmolecular Φfluorescence 131, 14%2 4 -73, 54, 8%5 66%1 21%1 NA 1 H-Rydberg results*τrad/τtot 2 Φfluorescent = 0. 69ΦOH(A) Φfluorescent = 9. 0 Fluorescent results Φfluorescent = 0. 67ΦOH(A) Φfluorescent = 8. 7 Harich et al. J. Chem. Phys. 2000, 113, 10073. 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. 1 2 D. 13

Jet-Cooling 14

Jet-Cooling 15

Laser Spectroscopy and Reactivity (La. SR) Lab 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) 16

Questions 17