XXth century_physics
XXth century_physics
XXth century_physics
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James Franck<br />
Gustav Hertz<br />
”...it is not possible to make the assumption, as<br />
Bohr has done recently, that in helium the 20.5<br />
volt beams and in mercury the 4.9 volt beams lead<br />
only to secondary ionization, such that the shortwavelength<br />
radiation [resulting from inelastic<br />
collisions] causes a photoelectric effect at the<br />
electrodes or at the impurities present in the gas.”<br />
James Franck, Gustav Hertz (1916)<br />
”Franck and Hertz assume that 4.9 volts<br />
corresponds to the energy necessary to remove<br />
an electron from the mercury atom, but it seems<br />
that their experiments may possibly be consistent<br />
with the assumption that this voltage correspond<br />
only to the transition from the normal state to<br />
some other stationary state of the neutral atom...”<br />
Niels Bohr (1915)
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