Phys. Rev. Lett. 7, 229–231 (1961)Two-Photon Excitation in CaF2: Eu2+Received 28 August 1961; published in the issue dated 15 September 1961 © 1961 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.7.229
DOI:
10.1103/PhysRevLett.7.229
PACS:
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