The first rare earth carbonyls have been prepared by codeposition of neodymium and ytterbium atoms with carbon monoxide in argon matrices. The new rare earth carbonyls were detected by infrared spectroscopy. The final product of the neodymium reaction was assigned to Nd(CO)6 and infrared absorptions were assigned for the lower carbonyls Nd(CO), _s.No assignment of the ytterbium data was made.
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