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Saturation spectroscopy with multiple‐frequency excitation
1.It should be mentioned that the term “crossover” is sometimes used in connection with the lines occurring in nonlinear spectroscopy which do not correspond to an actual resonance frequency and would therefore not be observed in linear spectroscopy. The dips at in Fig. 1 are examples of this phenomenon, which is also observed with single‐frequency excitation if there is more than one molecular resonance (sharing a common level) within the Doppler‐broadened line. [See, e.g., M. S. Feld and A. Javan, Phys. Rev. 177, 540 (1969).]
2.F. Spieweck, IEEE Trans. Instrum. Meas. IM‐27, 398 (1978).
3.V. S. Letokhov and V. P. Chebotayev, Nonlinear Laser Spectroscopy (Springer, Berlin, 1977), p. 64.
4.F. Vilbig, Lehrbuch der Hochfrequenztechnik (Akademische Verlagsgesellschaft, Frankfurt am Main, 1958), Vol. 2, p. 444.
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