Abstract
Positive molecular ion formation in plasma desorption (PD) by hydride abstraction leading to [M − H] + molecular ions is not a frequently observed phenomenon. An example of a compound that exhibits an [M − H] + molecular ion in its PD spectrum is the neutral lipid cholesterol. Data on the initial radial velocity distribution of the [M − H] + ion of cholesterol are presented and compared to data on the radial velocity distribution of the M + molecular ion of a structurally similar compound (ergosterol). The distribution for [M − H] + cholesterol ions is broader and its centroid is closer to zero radial velocity than the corresponding distribution for ergosterol M + ions. These data support a model suggesting formation of [M − H] + by a “self” chemical ionization type reaction.
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