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  1. R. T. Ku, E. D. Hinkley, J. O. Sample, Appl. Opt. 14, 854 (1975).
    [CrossRef] [PubMed]
  2. R. T. Ku, E. D. Hinkley, “Long-Path Laser Monitoring of Atmospheric Carbon Monoxide—1975 Regional Air Pollution Study (St. Louis),” Technical Report to the U.S. Environmental Protection Agency (April1976).
  3. S. H. Groves, K. W. Nill, A. J. Strauss, Appl. Phys. Lett. 25, 331 (1974).
    [CrossRef]
  4. R. A. McClatchey, J. E. A. Selby, “Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 μm,” AFCRL Report Tr-74-0003 to the Air Force Systems Command (3January1974).
  5. E. D. Hinkley, K. W. Nill, F. A. Blum, Laser Spectroscopy of Atoms and Molecules, H. Walther, Ed. (Springer-Verlag, Heidelberg, 1976), Chapter 2.
  6. W. Schnell, G. Fischer, Appl. Opt. 14, 2058 (1975); G. Fischer, Swiss Observatoire Cantonal; personal communication.
    [CrossRef] [PubMed]
  7. We are indebted to C. Freed of MIT Lincoln Laboratory for use of his CO2 laser apparatus, and to W. A. McClenny of the U. S. Environmental Protection Agency for suggesting the spectroscopic study of ammonia.
  8. J. S. Garing, H. H. Nielsen, K. N. Rao, J. Mol. Spectrosc. 3, 496 (1959).
    [CrossRef]
  9. J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
    [CrossRef]
  10. C. A. Kennedy, K. J. Linden, J. Appl. Phys. 41, 252 (1970).
    [CrossRef]

1975 (2)

1974 (1)

S. H. Groves, K. W. Nill, A. J. Strauss, Appl. Phys. Lett. 25, 331 (1974).
[CrossRef]

1973 (1)

J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
[CrossRef]

1970 (1)

C. A. Kennedy, K. J. Linden, J. Appl. Phys. 41, 252 (1970).
[CrossRef]

1959 (1)

J. S. Garing, H. H. Nielsen, K. N. Rao, J. Mol. Spectrosc. 3, 496 (1959).
[CrossRef]

Blum, F. A.

E. D. Hinkley, K. W. Nill, F. A. Blum, Laser Spectroscopy of Atoms and Molecules, H. Walther, Ed. (Springer-Verlag, Heidelberg, 1976), Chapter 2.

Calawa, A. R.

J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
[CrossRef]

Fischer, G.

Garing, J. S.

J. S. Garing, H. H. Nielsen, K. N. Rao, J. Mol. Spectrosc. 3, 496 (1959).
[CrossRef]

Groves, S. H.

S. H. Groves, K. W. Nill, A. J. Strauss, Appl. Phys. Lett. 25, 331 (1974).
[CrossRef]

Harman, T. C.

J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
[CrossRef]

Hinkley, E. D.

R. T. Ku, E. D. Hinkley, J. O. Sample, Appl. Opt. 14, 854 (1975).
[CrossRef] [PubMed]

E. D. Hinkley, K. W. Nill, F. A. Blum, Laser Spectroscopy of Atoms and Molecules, H. Walther, Ed. (Springer-Verlag, Heidelberg, 1976), Chapter 2.

R. T. Ku, E. D. Hinkley, “Long-Path Laser Monitoring of Atmospheric Carbon Monoxide—1975 Regional Air Pollution Study (St. Louis),” Technical Report to the U.S. Environmental Protection Agency (April1976).

Kennedy, C. A.

C. A. Kennedy, K. J. Linden, J. Appl. Phys. 41, 252 (1970).
[CrossRef]

Ku, R. T.

R. T. Ku, E. D. Hinkley, J. O. Sample, Appl. Opt. 14, 854 (1975).
[CrossRef] [PubMed]

R. T. Ku, E. D. Hinkley, “Long-Path Laser Monitoring of Atmospheric Carbon Monoxide—1975 Regional Air Pollution Study (St. Louis),” Technical Report to the U.S. Environmental Protection Agency (April1976).

Linden, K. J.

C. A. Kennedy, K. J. Linden, J. Appl. Phys. 41, 252 (1970).
[CrossRef]

McClatchey, R. A.

R. A. McClatchey, J. E. A. Selby, “Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 μm,” AFCRL Report Tr-74-0003 to the Air Force Systems Command (3January1974).

McVittie, J. P.

J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
[CrossRef]

Nielsen, H. H.

J. S. Garing, H. H. Nielsen, K. N. Rao, J. Mol. Spectrosc. 3, 496 (1959).
[CrossRef]

Nill, K. W.

S. H. Groves, K. W. Nill, A. J. Strauss, Appl. Phys. Lett. 25, 331 (1974).
[CrossRef]

E. D. Hinkley, K. W. Nill, F. A. Blum, Laser Spectroscopy of Atoms and Molecules, H. Walther, Ed. (Springer-Verlag, Heidelberg, 1976), Chapter 2.

Ralston, R. W.

J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
[CrossRef]

Rao, K. N.

J. S. Garing, H. H. Nielsen, K. N. Rao, J. Mol. Spectrosc. 3, 496 (1959).
[CrossRef]

Sample, J. O.

Schnell, W.

Selby, J. E. A.

R. A. McClatchey, J. E. A. Selby, “Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 μm,” AFCRL Report Tr-74-0003 to the Air Force Systems Command (3January1974).

Strauss, A. J.

S. H. Groves, K. W. Nill, A. J. Strauss, Appl. Phys. Lett. 25, 331 (1974).
[CrossRef]

Walpole, J. N.

J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
[CrossRef]

Appl. Opt. (2)

Appl. Phys. Lett. (2)

J. N. Walpole, A. R. Calawa, R. W. Ralston, T. C. Harman, J. P. McVittie, Appl. Phys. Lett. 23, 620 (1973); J. N. Walpole, A. R. Calawa, T. C. Harman, S. H. Groves, Appl. Phys. Lett. 28, 552 (1976).
[CrossRef]

S. H. Groves, K. W. Nill, A. J. Strauss, Appl. Phys. Lett. 25, 331 (1974).
[CrossRef]

J. Appl. Phys. (1)

C. A. Kennedy, K. J. Linden, J. Appl. Phys. 41, 252 (1970).
[CrossRef]

J. Mol. Spectrosc. (1)

J. S. Garing, H. H. Nielsen, K. N. Rao, J. Mol. Spectrosc. 3, 496 (1959).
[CrossRef]

Other (4)

We are indebted to C. Freed of MIT Lincoln Laboratory for use of his CO2 laser apparatus, and to W. A. McClenny of the U. S. Environmental Protection Agency for suggesting the spectroscopic study of ammonia.

R. A. McClatchey, J. E. A. Selby, “Atmospheric Attenuation of Laser Radiation from 0.76 to 31.25 μm,” AFCRL Report Tr-74-0003 to the Air Force Systems Command (3January1974).

E. D. Hinkley, K. W. Nill, F. A. Blum, Laser Spectroscopy of Atoms and Molecules, H. Walther, Ed. (Springer-Verlag, Heidelberg, 1976), Chapter 2.

R. T. Ku, E. D. Hinkley, “Long-Path Laser Monitoring of Atmospheric Carbon Monoxide—1975 Regional Air Pollution Study (St. Louis),” Technical Report to the U.S. Environmental Protection Agency (April1976).

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Figures (3)

Fig. 1
Fig. 1

Temperature tuning curve for the widely tunable diode laser. Strongly absorbing regions for some common pollutant gases are indicated.

Fig. 2
Fig. 2

Laser spectroscopy of C2H4 using diode laser operating cw at 77 K (liquid nitrogen-cooled). Trace (a) is for the evacuated cell, (b) for 1 Torr C2H4, and (c) for 13,200 ppm C2H4 in air at atmospheric pressure. Cell length is 30 cm.

Fig. 3
Fig. 3

Laser spectroscopy of NH3 using diode laser in closed cycle refrigerator, operating at approximately 90 K. Trace (a) represents 0.1 Torr NH3, (b) is 0.46 Torr NH3 with 360 Torr air added, and (c) is 0.46 Torr NH3 with 750 Torr (1 atm) air added. The CO2 laser line is R(30) at 1084.635 cm−1. Cell length is 30 cm.

Tables (1)

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Table I Spectral Absorption Coefficient (k) and Predicted Sensitivity for Measurement Over a 1-km Atmospheric Path for Several Pollutant Gases at the Indicated Frequencies (ν)

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