Grigory Landsberg
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Grigory Samuilovich Landsberg was a Soviet physicist who worked in the fields of optics and spectroscopy. Together with Leonid Mandelstam he co-discovered inelastic combinational scattering of light, which is known as Raman scattering.
Landsberg on a Russian postcard
Leonid Mandelstam
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Leonid Isaakovich Mandelstam or Mandelshtam was a Soviet and Russian physicist.
Leonid Mandelstam