1. D. H. Baird and G. R. Bird, Rev. Sci. Instr. 25, 319 (1954).RSINAK0034-6748
2. P. H. Verdier, Rev. Sci. Instr. 29, 646 (1958).RSINAK0034-6748
3. C. H. Townes and A. L. Schawlow, Microwave Spectroscopy (McGraw‐Hill Book Company, Inc., New York, 1955), p. 412, Eqs. 15‐1 and 15‐2.
4. Kilb, Lin, and Wilson, J. Chem. Phys. 26, 1695 (1957). JCPSA60021-9606
5. Alternative treatments have been given by: K. T. Hecht and D. M. Denison, J. Chem. Phys. 26, 31 (1957); JCPSA60021-9606