# INFRARED SPECTRA OF $ZrH_{4}$ AND $HfH_{4}$ IN SOLID ARGON

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 Title: INFRARED SPECTRA OF $ZrH_{4}$ AND $HfH_{4}$ IN SOLID ARGON Creators: Chertihin, George V.; Andrews, Lester Issue Date: 1995 Publisher: Ohio State University Abstract: Reactions of pulsed laser evaporated Zr and Hf atoms with $H_{2}$ during condensation in excess argon give strong infrared absorptions at 1623.6 and $1678.4 cm^{-1}$. These bands are assigned, respectively, to the antisymmetric stretching fundamentals of the tetrahedral $ZrH_{4}$ and $HfH_{4}$ molecules experimentally observed here for the first time. Perdeutero counterparts were observed at 1166.6 and $1201.7 cm^{-1}$, respectively. Confirmation of the tetrahydride identification is found in the four bands observed for the HD reaction products, which are due to symmetric and antisymmetric $M-H_{2}$ and $-D_{2}$ stretching modes for the $MH_{2}D_{2}$ molecules. Lanthanide contraction and relativistic effects cause the fundamental for $HfH_{4}$ to be slightly higher than that for $ZrH_{4}$. Description: Author Institution: University of Virginia, Charlottesville, VA 22901 URI: http://hdl.handle.net/1811/29762 Other Identifiers: 1995-TC-08