By E. Richard Cohen, Jesse W. M. DuMond, H. A. Bethe, E. E. Salpeter (auth.)
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Extra info for Atoms I / Atome I
US. Nat. FuT. , Techn. News Bull. 39, 1 (1955). U E. F. FLORMAN: U. S. Nat.. Bur. , Techn. News Bull. 39,1 (1955). IliA. A. MICHELSON, PEASE and PEARSON: Astrcphys. J. 82, 26 (1935). 11 W. C /l1':PFPSON: J. Cpt. Sec. Amer. 31. 11\7 (1941). 12 E. R. ROSA ann N. E. })ORSEY: Bull. S. Nat. Bur. Stand. 3, 433 (1907). 30 E. RICHARD COHEN and JESSE W. M. DuMoND: Fundamental Constants. Sect. 20· about 3 km. sec. -1, a disagreement which, though small judged by earlier standards, is uncomfortably large relative to the claimed probable errors.
M. WATTS: Phys. Rev. 81, 70 (1951). 7 AKE NILSSON: Ark. Fysik 6, No. 49, 513 (1953). The determination of the critical excitation potentials of x-ray lines is so closely associated with the above experiments that we include this reference here. 40 E. RICHARD COHEN and JESSE W. M. DuMOND: Fundamental Constants. Sect. 25. 2) The experiment is usually referred to as a measurement of h/e and indeed the fact that it involves this ratio is the chief reason why it is of interest. Since the uncertainties in our knowledge of c2 and A now approach the same order of magnitude as our uncertainty in h/e, it is preferable to describe the experiment more nearly in terms of what was actually measured-the threshold voltage at which radiation of a specified wavelength (on the SIEGBAHN scale) first appears in the continuous x-ray spectrum.
The band-pass tral profile which were characteristic of the x-ray spectrometer or monochromator is here assumed to be a "witch" (or CAUCHY distribtuionJ and this latter folded into the postulated profirst observed by OHfile of the upper diagram yields an observed isochromat, F(zJ, whose second derivative, F" (zJ, is shown in the lower diagram. The two contributions, s g (zJ and LIN 2. The OHLIN irreh((zJ, to this second derivative curve are also shown. The contribution, sg(z), gularities differ in shape is generated as the result of the second order discontinuity, of slope, s = tan e.
Atoms I / Atome I by E. Richard Cohen, Jesse W. M. DuMond, H. A. Bethe, E. E. Salpeter (auth.)