Auger electron spectra of the cycloalkanes C3 through C6

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Abstract
Gas phase Auger electron spectra are presented for the cycloalkane series C3 through C6. In a comparison with similar data taken on ethylene and the normal alkanes it is shown that the lineshapes grade smoothly from being ethylenelike (prototypical of sp2 hybridization), for cyclopropane to normal alkanelike for cyclohexane (normal sp3 hybridization). Cyclobutane shows observable remnants of olefinic character while cyclopentane differs only slightly from its corresponding normal alkane analog. These spectral changes closely mirror the relative chemical reactivity found for the cycloalkanes, which is often discussed in terms of the degree of double bond character present in small ring systems. As was the case for the normal alkanes, the overall position and widths of the Auger features remain essentially constant in energy over the entire series with an average hole–hole repulsion energy near 8 eV. The two‐hole final state appears, therefore, to be probing properties localized to the original core‐hole site.

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