In our previous work (Shen etal 2020 Metrologia 57 025015; Booth etal 2019 New J. Phys. 21 102001), we have reported the first primary quantum pressure standard based on the loss rate of cold rubidium atoms from a magnetic trap. We have shown that this standard is self-calibrating. That is, the single parameter required to quantify the pressure or particle flux impinging on the sensor atoms, , can be determined experimentally. In this paper, we refine our procedure to extract the trap loss rate coefficient by expressing the measured trap loss rate of the rubidium atoms as a convolution of the universal loss rate expression from Shen etal (2020 Metrologia 57 025015) and Booth etal (2019 New J. Phys. 21 102001) with the energy distribution of the rubidium atoms in the trap. We report improved values for ⁸⁷Rb–X (X = He, Ar, Xe, H₂, N₂, and CO₂) collision pairs. All are systematically higher than our previously reported values, although the differences are less than 2%. The calibration factor of an ionization gauge for nitrogen obtained using the cold atom standard, i _g = 0.950 (19), agrees with the value obtained by NIST, i _g = 0.940 (26) calibrated against their orifice flow standard.

在我们之前的工作中（Shen等人2020 Metrologia 57 025015；Booth等人2019 New J. Phys. 21 102001），我们报道了第一个基于冷铷原子从磁阱中损失率的初级量子压力标准。我们已经证明该标准是自校准的。也就是说，量化撞击传感器原子的压力或粒子通量所需的单个参数可以通过实验确定。在本文中，我们通过将测量的铷原子陷阱损失率表示为来自 Shen et al (2020 Metrologia 57 025015) 和 Booth等人(2019 New J. Phys. 21 102001) 与陷阱中铷原子的能量分布。我们报告的改进为值⁸⁷ r -B-的X（X =氦，氩，氙，H ₂，N ₂和CO ₂）的碰撞对。尽管差异小于 2%，但所有这些都系统地高于我们之前报告的值。使用冷原子标准获得的氮离子计校准因子i _g = 0.950 (19)，与 NIST 获得的值一致，i _g = 0.940 (26) 根据其孔板流量标准进行校准。