The Production of $F^{'}$ , $M$ , and $R$ Centers in NaCl at Room Temperature

One may produce a variety of absorption centers to the long-wavelength side of the

F

band. The ones most carefully studied are the

F^{'}

R_{1}

R_{2}

, and

M

bands. In NaCl at room temperature, the

R

bands overlap and resemble the

F^{'}

band; indeed, it is not possible to tell if the erregt state, so extensively studied by the workers in Göttingen, is due to

R

F^{'}

centers. An experimental study of these bands has been made. It indicates that the

F

F^{'}

, and

M

band form during x-radiation. Since the lifetime of the

F^{'}

band at 300°K is short, it dissociates during the course of the usual absorption measurement. To obtain reliable growth rate of the

F

band during x-radiation the contribution of the

F^{'}

band must be taken into account. The

R

bands are formed primarily by optical bleaching of the

F

band. The experiments indicate that the "erregt" state at room temperature is due to the presence of the

R

bands.

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The Production ofF′,M, andRCenters in NaCl at Room Temperature