Atomic and nuclear properties of materials:
Liquid oxygen (O₂) (O )

Quantity	Value	Units	Value	Units
Atomic number	8
Atomic mass	15.9994(3)	g mole-1
Density	1.14	g cm-3
Mean excitation energy	95.0	eV
Minimum ionization	1.788	MeV g-1cm2	2.040	MeV cm-1
Nuclear collision length	61.3	g cm-2	53.75	cm
Nuclear interaction length	90.2	g cm-2	79.03	cm
Pion collision length	88.5	g cm-2	77.54	cm
Pion interaction length	121.9	g cm-2	106.8	cm
Radiation length	34.24	g cm-2	30.01	cm
Critical energy	66.82	MeV (for e-)	65.04	MeV (for e+)
Molière radius	10.87	g cm-2	9.522	cm
Plasma energy	21.77	eV
Muon critical energy	890.	GeV
Melting point	54.36	K	-218.8	C
Boiling point @ 1 atm	90.20	K	-182.9	C
Index of refraction (@ STP, Na D)	1.22

For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PS PDF TEXT
Table of muon dE/dx and Range: PS PDF TEXT
Explanation of some entries
Note: Index of refraction at boiling point, 1 atm.
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients