Measurement of atomic hydrogen density in non-thermal H2 plasmas via threshold ionisation-molecular beam mass spectrometryW. G. Wang, Y. Xu, C. Dong, N. Z. Zhang, K. Y. Hou and H. Y. LiEur. Phys. J. D, 50 3 (2008) 257-264DOI: https://doi.org/10.1140/epjd/e2008-00232-x