Figure 5.
Cross section distributions for the [M + 9H]9+ charge state of electrosprayed ubiquitin ions obtained from OMS measurements. The OMS spectrum has been recorded from the ff to the 37·ff overtone. m indicates the harmonic frequency number allowing the ion transmission. Dashed lines indicate divisions for compact, partially folded, and elongated conformational states. Four conformations (labeled A, B, C and D, Ω= 1417, 1508, 1612, and 1741 Å2, respectively) have been chosen to simulate structural transitions (see Figure 6 and the text for details).