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Table 1 Overview of the properties of the argon beam at different temperatures of the valve housing T valve, repetition rates frep (which are determined by the velocity of the stored ammonia molecules), ammonia velocities \(v_{\mathrm {ND_{3}}}\), and durations of the current pulse applied to the valve Δtpulse. The second block lists properties of the beams measured at detection zone II: the relative beam intensity, mean arrival time, 〈τ〉, the width of the arrival time distribution Δτ, and the full width at half maximum (FWHM) length of the argon packet \(L=\left \langle v_{Ar} \right \rangle \times 2 \sqrt {2\ln 2}~\Delta \tau \). Finally, the last block lists the parameters found from a simultaneous fit to the time-of-flight distributions measured at both detectors: the mean 〈vAr〉 and standard deviation \(\sigma _{v_{Ar}}\) of the velocity distribution, duration of valve opening time, and the effective distance between the valve and detection zone II

From: A detailed account of the measurements of cold collisions in a molecular synchrotron

T valve (°C) frep (Hz) \(v_{\mathrm {ND_{3}}}\) (m/s) Δtpulse (μs) rel. int. τ〉 (ms) Δτ (μs) L (mm) vAr〉 (m/s) \(\sigma _{v_{\text {Ar}}}\) (m/s) pw (μs) Δz (m)
+30 153 121.1 27.3 3.00 ±0.20 2.207 96 137 570.56 24.01 22.41 1.265
  175 138.8   2.74 ±0.18 2.205 94 134 571.41 24.09 22.48 1.265
−30 153 121.1 25.2 2.02 ±0.12 2.380 124 163 524.08 27.57 11.24 1.255
  175 138.8   1.91 ±0.11 2.378 122 160 524.73 27.30 13.73 1.254
−90 153 121.1 23.6 1.31 ±0.11 2.604 162 192 474.51 28.48 10.00 1.245
  175 138.8   1.21 ±0.10 2.597 159 189 475.40 29.22 10.00 1.245
−150 153 121.1 22.8 1.11 ±0.10 2.921 173 183 421.92 24.32 10.00 1.241
  175 138.8   1.00 ±0.09 2.916 175 185 423.40 24.98 10.00 1.242