Atomic and nuclear properties of oxygen gas (O2)
QuantityValueUnits ValueUnits
Atomic number 8     
Atomic mass 15.999(3) g mole-1   
Specific gravity (20° C, 1 atm) 1.332E-03 g cm-3   
Mean excitation energy 95.0 eV   
Minimum ionization 1.801 MeV g-1cm2 2.398E-03 MeV cm-1
Nuclear collision length 61.3 g cm-2 4.606E+04 cm
Nuclear interaction length 90.2 g cm-2 6.772E+04 cm
Pion collision length 88.5 g cm-2 6.644E+04 cm
Pion interaction length 121.9 g cm-2 9.156E+04 cm
Radiation length 34.24 g cm-2 2.571E+04 cm
Critical energy 81.45 MeV (for e-) 79.62 MeV (for e+)
Molière radius 8.91 g cm-2 6695. cm
Plasma energy ωp 0.74 eV   
Muon critical energy 1050. GeV   
Melting point 54.36 K -218.8 C
Boiling point @ 1 atm 90.20 K -182.9 C
Index of refraction (0° C, 1 atm, Na D) 271. (n-1)x106     
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
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients