Abstract

A quantum-cascade laser operating at a wavelength of 8.1μm was used for high-sensitivity absorption spectroscopy of methane (CH<sub>4</sub>). The laser frequency was continuously scanned with current over more than 3cm<sup>-1</sup>, and absorption spectra of the CH<sub>4</sub> ν<sub>4</sub> P branch were recorded. The measured laser linewidth was 50 MHz. A CH<sub>4</sub> concentration of 15.6 parts in 10<sup>6</sup>(ppm) in 50 Torr of air was measured in a 43-cm path length with ±0.5-ppm accuracy when the signal was averaged over 400 scans. The minimum detectable absorption in such direct absorption measurements is estimated to be 1.1 × 10<sup>-4</sup>. The content of <sup>13</sup>CH<sub>4</sub> and CH<sub>3</sub>D species in a CH<sub>4</sub> sample was determined.

© 1999 Optical Society of America

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1999

1998

1997

J. Faist, C. Gmachl, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, Appl. Phys. Lett. 70, 2670 (1997).

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

1994

1981

A. J. Robiette, J. Mol. Spectrosc. 86, 143 (1981).

1957

H. Graig, Geochim. Cosmochim. Acta 12, 133 (1957).

Arbore, M.

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

Baillargeon, J. N.

Bergamaschi, P.

Boardman, L.

C. Oppenheimer, P. Francis, M. Burton, A. J. H. Maciejewski, and L. Boardman, Appl. Phys. B 67, 505 (1998).

Burton, M.

C. Oppenheimer, P. Francis, M. Burton, A. J. H. Maciejewski, and L. Boardman, Appl. Phys. B 67, 505 (1998).

Cai, S.

Capasso, F.

Cho, A. Y.

Dlugokencky, E. J.

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

Faist, J.

K. Namjou, S. Cai, E. A. Whittaker, J. Faist, C. Gmachl, F. Capasso, D. L. Sivco, and A. Y. Cho, Opt. Lett. 23, 219 (1998).

J. Faist, C. Gmachl, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, Appl. Phys. Lett. 70, 2670 (1997).

Fejer, M. M.

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

Fontes, J. Ch.

P. Fritz and J. Ch. Fontes, Handbook of Environmental Isotope Geochemistry (Elsevier, New York, 1980), Vol. 1, pp. 1–19.

Francis, P.

C. Oppenheimer, P. Francis, M. Burton, A. J. H. Maciejewski, and L. Boardman, Appl. Phys. B 67, 505 (1998).

Fritz, P.

P. Fritz and J. Ch. Fontes, Handbook of Environmental Isotope Geochemistry (Elsevier, New York, 1980), Vol. 1, pp. 1–19.

Gmachl, C.

Graig, H.

H. Graig, Geochim. Cosmochim. Acta 12, 133 (1957).

Harren, F. J. M.

Harris, G. W.

Hartman, J. S.

Hollberg, L. W.

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

Hutchinson, A. L.

Kelly, J. F.

Maciejewski, A. J. H.

C. Oppenheimer, P. Francis, M. Burton, A. J. H. Maciejewski, and L. Boardman, Appl. Phys. B 67, 505 (1998).

Namjou, K.

Oomens, J.

Oppenheimer, C.

C. Oppenheimer, P. Francis, M. Burton, A. J. H. Maciejewski, and L. Boardman, Appl. Phys. B 67, 505 (1998).

Paldus, B. A.

Parker, D. H.

Petrov, K. P.

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

Robiette, A. J.

A. J. Robiette, J. Mol. Spectrosc. 86, 143 (1981).

Schupp, M.

Sharpe, S. W.

Sirtori, C.

J. Faist, C. Gmachl, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, Appl. Phys. Lett. 70, 2670 (1997).

Sivco, D. L.

Spence, T. G.

Tittel, F. K.

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

Waltman, S.

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

Whittaker, E. A.

Zare, R. N.

Appl. Opt.

Appl. Phys. B

K. P. Petrov, S. Waltman, E. J. Dlugokencky, M. Arbore, M. M. Fejer, F. K. Tittel, and L. W. Hollberg, Appl. Phys. B 64, 567 (1997).

C. Oppenheimer, P. Francis, M. Burton, A. J. H. Maciejewski, and L. Boardman, Appl. Phys. B 67, 505 (1998).

Appl. Phys. Lett.

J. Faist, C. Gmachl, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, Appl. Phys. Lett. 70, 2670 (1997).

Geochim. Cosmochim. Acta

H. Graig, Geochim. Cosmochim. Acta 12, 133 (1957).

J. Mol. Spectrosc.

A. J. Robiette, J. Mol. Spectrosc. 86, 143 (1981).

Opt. Lett.

Phys. World

F. Capasso, C. Gmachl, D. L. Sivco, and A. Y. Cho, Phys. World 12, 27 (1999).

Other

P. Fritz and J. Ch. Fontes, Handbook of Environmental Isotope Geochemistry (Elsevier, New York, 1980), Vol. 1, pp. 1–19.

“NIST Database for the Isotopic Composition of Selected Atmospheric Constituents,” http://deuterium.nist.gov.

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