Rotational Zeeman effect in carbon monoxide as determined by magnetic vibrational circular dichroism

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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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