Table 1 Overview of the properties of the argon beam at different temperatures of the valve housing T _valve, repetition rates f_rep (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 Δt_pulse. 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 〈v_Ar〉 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