The time evolution of the TOF spectrum of 3He2 + ions at the lowest CH4 pressure used

2013-09-06T00:00:00Z (GMT) by C Kyriakides B S Clarke V H S Kwong

Figure 2. The time evolution of the TOF spectrum of 3He2 + ions at the lowest CH4 pressure used. Only 3He2 +, m/q = 1.5, and some m/q = 2 are stored. No ion with m/q > 2 is stored. The FWHM of 3He2 + is 26.1 ± 2.9 ns, 26.8 ± 3.3 ns, 25.8 ± 3.1 ns, 25.0 ± 3.0 ns and 24.8 ± 3.8 ns for the recorded times of 10, 70, 130, 190 and 250 ms, respectively. Here, t = 10 ms corresponds to 50 ms after the cathode activation, t = 70 ms corresponds to 110 ms after cathode activation, t = 130 ms corresponds to 170 ms and so on.

Abstract

We report our measured values for the sum of single and double charge transfer rate coefficients between 3He2 + and H2, CH4, N2 and CO. Our values are 2.4 ± 0.2 × 10−9 cm3 s−1 for H2, 6.3 ± 0.9 × 10−9 cm3 s−1 for CH4, 4.0 ± 0.3 × 10−9 cm3 s−1 for N2 and 4.7 ± 0.4 × 10−9 cm3 s−1 for CO. The values are obtained at equivalent temperatures of 1200–2400 K.