Mass spectra of some deuterated ethanes. I. The effect of ionizing voltage

The mass spectra of seven ethanes (d0–d6) have been obtained at various ionizing voltages. For low ionizing voltages (i.v. < 13.4 V), the only remaining ions are the parent molecule ion and that resulting from the loss of two hydrogen atoms (m/e 30 and m/e 28 in C2H6). With the exception of C2H5D, the ratio of the ion currents for these species remained reasonably constant below i.v. = 13.0. The sensitivity for detection of the molecule ion was found to decrease continuously as the D atom content was increased, both for high (70 V) and for low (12.8 V) ionizing voltages.