Abstract
A tunable microwave frequency was added to, or subtracted from fixed frequency13C16O2 and12C18O2 laser lines using the nonlinearity of molecular absorptions. In this way the frequency of 30 transitions of the ν2-band of ammonia were measured with an accuracy of ±0.0005 cm−1. A further four transitions were measured with an accuracy of ±0.0001 cm−1 by saturating the two-photon transition and observing the Lamb dip. For laser lines up to 11 GHz off-resonant with in frared transitions Doppler-limited signals were observed with microwave power densities of only 10 mW/cm2 using a wide-band intracavity cell.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
F. Shimizu: J. Chem. Phys.52, 3572 (1970)
Y. Ueda, K. Shimoda: InLaser Spectroscopy, ed. by (1975) Springer Verlag, N.Y. (1975)
S.M. Freund, T. Oka: Phys. Rev. A13, 2178 (1976)
H. Jones: Appl. Phys.14, 169 (1977)
C.K. Asawa, T.K. Plant: Appl. Phys. Lett.30, 96 (1977)
F. Allario, R.K. Seals: Appl. Opt.14, 2229 (1975)
F. Shimizu: Phys. Rev. A10, 950 (1974)
T. Oka: InFrontiers in Laser Spectroscopy, Les Houches (1975) ed. by Balian et al. North Holland, Amsterdam 1977) pp. 531–569
M. Takami: Jap. J. Appl. Phys. (in press)
C. Freed, A.H.M. Ross, R.G. O'Donnel: J. Mol. Spectrosc.49, 439 (1974)
J.S. Garing, H.H. Nielsen, K.N. Rao: J. Mol. Spectrosc.3, 496 (1959)
R.L. Poynter, R.K. Kakar: Astrophysical J. Supp. Ser.29, 87 (1975)
D. Laughton, S.M. Freund, T. Oka: J. Mol. Spectrosc.62, 263 (1976)