P. Lazzeretti et al., CONDITIONS FOR INVARIANCE OF MOLECULAR MAGNETIC-PROPERTIES IN LANDAU GAUGE TRANSFORMATIONS, The Journal of chemical physics, 103(5), 1995, pp. 1852-1859
General constraints for invariance of magnetic properties in a gauge t
ransformation are analyzed. Sum rules relative to the transformation f
rom Coulomb to Landau gauges are examined in particular. Numerical tes
ts for hydrogen fluoride, water, ammonia, and methane molecule have be
en carried out in large basis set calculations, using random-phase app
roximation. The conditions for invariance are severe conditions for ac
curacy of variational molecular wave functions. (C) 1995 American Inst
itute of Physics.