Abstract
The magnetic vibrational circular dichroism (MVCD) of carbon monoxide has been measured by use of a Fourier transform infrared vibrational circular dichroism spectrometer with an 8 T magnet. At 0.5 cm−1 resolution, the spectra are rotationally resolved, and both the sign and the magnitude of the g-factor for the rotational Zeeman effect in C≡O can be determined using moment analysis to deconvolve the MVCD band shape. A rotational g value of −0.262 was obtained with an estimated error in accuracy of ±0.026 and a precision of ±0.011. Averaging individual gJ determinations for more than 30 transitions in the R- and P-branches showed a much higher precision in the measurement. That this value agrees with the results of earlier, more precise, microwave-based measurements as well as theoretical determinations of gJ confirms that MVCD can be used as an alternate method to determine molecular Zeeman g factors.
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