Figure 4.

Normalized intensity as a function of activation voltages (0-150V) are shown for the [14Pro+2H]²⁺ cluster. Evaporation of neutrals (a) for the [14Pro+2H]²⁺ cluster formed from the racemic solution produces [xPro+2H]²⁺ where x = 9 to 13. At ~60V the doubly charged ions begin to fission (b) to form singly charged [xPro+H]⁺ clusters where x = 1 to 6. (c) Evaporation and (d) fission of the homochiral [14Pro+2H]²⁺ cluster electrosprayed from 100% L-proline solution is also shown. Normalized intensity for the singly charged clusters formed from both the racemic and enantiopure solutions are magnified by a factor of two for better comparison. Furthermore, activation curves for the homochiral [14Pro+2H]²⁺ cluster are corrected to eliminate the dissociation byproducts of the [13Pro+2H]²⁺ that is present in the mobility selection of the [14Pro+2H]²⁺.