15min:

ALONZO MARTINEZ AND MICHAEL D. MORSE, Department of Chemistry, University of Utah, Salt Lake City, UT 84112.

The two major isotopic species (⁵⁸Ni and ⁶⁰Ni) of Ni(CO)₃(¹³CO) and NiCO have been investigated with a recently constructed infrared spectrometer. These molecules were observed by implementing a slit jet pulsed nozzle coupled to a modulated electrical discharge and a lock-in detection system. Typical nozzle pulses were approximately 2ms in duration, during which time the electrical discharge was modulated at a frequency of 15 kHz. Modulation of the electrical discharge allowed the use of a lock-in detector to improve the signal to noise ratio. A lead salt diode laser beam was multipassed across the output of the slit jet for 15 passes using a Perry cell, and the transmitted IR intensity was monitored. Analysis of the resulting spectra for the ¹³CO and CO stretching modes in Ni(CO)₃(¹³CO) and NiCO respectively, lead to the following constants (1 errors limits in parentheses):

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