Comb-Assisted Cavity Ring Down Spectroscopy

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Presentation transcript:

Comb-Assisted Cavity Ring Down Spectroscopy of 17O enriched water between 7443 and 7921 cm–1 D. Mondelain, S.N. Mikhailenko, E.V. Karlovets, S. Béguier, S. Kassi, and A. Campargue Univ. Grenoble Alpes, CNRS France, Institute of Atmospheric Optics Tomsk Russia

17O has S= 5/2 Isotopologue Abundance H216O 0.9973 H218O 2.0×10-3 3.7×10-4 HD16O 3.1×10-4 HD18O 6.23×10-7 HD17O 1.16×10-7 17O has S= 5/2

FTS literature Toth RA. Transition frequencies and strengths of H217O and H218O: 6600 to 7640 cm−1. Appl Opt 1994;33:4868-79 (L=2.39 m, 55% enrichment)

A compact CW-CRDS spectrometer 1265-1750 nm (5690-7920 cm-1) Photodiode Optical isolator Laser diode Coupler AO Modulator laser ON Laser OFF -50 50 100 threshold n=f(T,I) 6nm/diode Wavemeter 4

Routine CRDS: ~ 100 laser diodes (6nm/diode) 1265-1750 nm (5690-7920 cm-1) t~ 100-750 µs Cell length : 1.4 m volume : 150 cm3 Y scale Sensitivity : 3x10-11 cm-1 Dynamic range ~ 104-105 X scale Scan speed : 30 cm-1 / hour Spectral accuracy: ~ 1x10-3 cm-1

CRDS natural water FTS literature

17O enriched water (about 60%enrichment)

FTS literature

FTS literature

SRFC Wavemeter Coupler Photodiode Optical isolator Laser diode Coupler + ± 400 kHz- Photodiode Optical isolator Laser diode Coupler AO Modulator laser ON Laser OFF -50 50 100 threshold n=f(T,I) 6nm/diode Wavemeter 10 % 10 % 80 % 10

About 4150 lines (4670 transitions ) H216O, H217O, H218O, HD16O, HD17O, HD18O Intensities from 10-28 to 10-22 cm/molecule

H217O HD17O Total: 398 transitions (literature: 4) 207 new levels Total: 1596 transitions (literature:300) 329 new levels

Line position accuracy Comparison to FS-CRDS referenced to a Cs clock by Sironneau and Hodges - JQSRT 152 (2015)1 71 H216O positions measured with an uncertainty of 3MHz (1x10-4 cm-1) average difference= -0.2x10-4 cm-1 rms= 1.1x10-4 cm-1

Sub-kHz accuracy is achieved by Lamb dip spectroscopy Optical feedback frequency stabilized cavity ring-down spectroscopy JCP 142 (2015)

I17O =5/2 -> electric quadrupole, 17O spin-rotation and… I17O =5/2 -> electric quadrupole, 17O spin-rotation and….. I H+H= 1 terms (ortho transition )

FTS literature

Merci! 20