Einstein, Albert.
'Die Plancksche Theorie der Strahlung und die Theorie der spezifischen Waerme'.
Annalen der Physik,
22
(1907)
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">daß letztere für
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= 300 gelten, mit Hilfe der dargestellten
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Beziehung zwischen
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<
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Börnstein einige Angaben über ultrarote Eigenschwingungen
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(metallische Reflexion, Reststrahlen) einiger durchsichtiger fester
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Körper; die beobachteten
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sind in nachstehender Tabelle
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unter ,,
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“ angegeben; die Zahlen unter ,,
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“ sind obiger
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Tabelle entnommen, soweit sie sich auf Atome von abnorm
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kleiner spezifischer Wärme beziehen; für die übrigen soll
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48
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48 </
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48 </
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<
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normaler spezifischer Wärme; in der Tat sind die Wellen-
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längen ihrer ultraroten Eigenschwingungen größer als 48
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Die übrigen Stoffe enthalten lauter Atome mit abnorm kleiner
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spezifischer Wärme (ausgenommen Ca); in der Tat liegen die
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Eigenfrequenzen dieser Stoffe zwischen 4
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8
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und 48
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Im
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allgemeinen sind die aus den spezifischen Wärmen theoretisch
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ermittelten
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erheblich größer als die beobachteten. Diese
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Abweichungen können vielleicht in einer starken Veränderlich-
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keit der Frequenz des Elementargebildes mit der Energie
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desselben ihre Erklärung finden. Wie dem auch sein mag,
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jedenfalls ist die Übereinstimmung der beobachteten und be-
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rechneten
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hinsichtlich der Reihenfolge, sowie hinsichtlich der
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Größenordnung sehr </
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anwenden. Die ultrarote Eigenfrequenz desselben ist nicht
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bekannt, läßt sich jedoch unter Zugrundelegung der dar-
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gelegten Theorie berechnen, wenn für einen Wert von
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die
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molekulare spezifische Wärme
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bekannt ist; das zu
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ge-
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hörige
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läßt sich aus der Kurve unmittelbar entnehmen, und
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man bestimmt hieraus
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nach der Beziehung (
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) =
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