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Susceptibility Echos in Linear Molecular Gases
1.C. H. Townes and A. L. Schawlow, Microwave Spectroscopy (McGraw‐Hill, New York, 1955).
2.N. Bloembergen has pointed out that a superradiant state is “… one in which an expectation value of the off‐diagonal element of the density matrix exists”. (See Ref. 4, p. 54.) It is in this sense that the term superradiant is used in this letter.
3.R. H. Dicke, Phys. Rev. 93, 99 (1954).
4.R. H. Dicke, Quantum Electronics, edited by P. Grivet and N. Bloembergen (Columbia U.P., New York, 1963), Vol. 1, p. 35.
5.Since a population change occurs, the diagonal elements of the density matrix have a perturbation proportional to These need not be considered, since they would not give a contribution to the susceptibility proportional to They would, however, be of importance were one interested in obtaining the internal energy from the expectation of the Hamiltonian.
6.The projection quantum number M need not appear explicitly since it does not change during the perturbation. All sums, however, are taken over M as well as J.
7.The result is where .
8.C. H. Lin, J. P. Heritage, and T. K. Gustafson (to be published).
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