Atomic and nuclear properties of hydrogen liquid (H2)
QuantityValueUnits ValueUnits
Atomic number 1     
Atomic mass 1.008(7) g mol-1   
Density 0.07080 g cm-3   
Mean excitation energy 21.8 eV   
Minimum ionization 4.034 MeV g-1cm2 0.2856 MeV cm-1
Nuclear interaction length 52.0 g cm-2 734.5 cm
Nuclear collision length 42.8 g cm-2 605.1 cm
Pion interaction length 82.0 g cm-2 1158. cm
Pion collision length 70.4 g cm-2 994.4 cm
Radiation length 63.04 g cm-2 890.4 cm
Critical energy 278.02 MeV (for e-) 271.50 MeV (for e+)
Muon critical energy 3102. GeV   
Molière radius 4.81 g cm-2 67.92 cm
Plasma energy ωp 7.64 eV   
Melting point 13.81 K -259.3 C
Boiling point @ 1 atm 20.28 K -252.9 C
Index of refraction (Na D) 1.112     
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries
Note: The isotopic mass of 1H is 1.007 825 032 23 (9) u (mass of the proton + mass of electron - binding energy of 13.61 eV [1.461E-09 u]).
Table of isotopes via WIKIPEDIA
x ray mass attenuation coefficients from NIST