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Microwave spectrum of methylmercury chloride: gas-phase determination of the electric dipole moment and 201Hg quadrupole coupling

✍ Scribed by Christopher A. Rego; A.Peter Cox

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
531 KB
Volume
139
Category
Article
ISSN
0009-2614

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✦ Synopsis

The nuclear quadrupole coupling constant of *"'Hg (I= 3/2 ) has been determined for CHXHgCl in the vapour by microwave spectroscopy. A value of eQq( *"Hg) = -1025 (3) MHz, along the axis of the symmetric top, has been determined for the vibrational ground state. An initial determination of the quadrupole coupling constant was made possible by radiofrequency pumping of the l-type doublets of the lowest bending mode, Y,, for which eQq(*"'Hg) = -1016( 6) MHz and the I-type doublet constant qS = 2.90( 1) MHz. eQq( WI) was confirmed to be -42.2( 2) MHz. The dipole moment of CH3HgCl has been determined from Stark effect measurements in the ground state as 3.4 ll(l1) D.

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The microwave spectrum of acetonitrile N-oxide shows that the molecule is a symmetric top. The spectrum of the common isotopic species, both 1% species. the 15N and 180 species have been assigned leading to the r, geometry of all heavy atoms. The nitrogen quadrupofe coupling cehstant is found to be