Atomic and nuclear properties of materials:
Carbon dioxide gas (CO₂)

Quantity	Value	Units	Value	Units
<Z/A>	0.49989
Specific gravity (20° C, 1 atm)	1.84E-03	g cm-3
Mean excitation energy	85.0	eV
Minimum ionization	1.819	MeV g-1cm2	3.351E-03	MeV cm-1
Nuclear collision length	60.7	g cm-2	3.297E+04	cm
Nuclear interaction length	88.9	g cm-2	4.828E+04	cm
Pion collision length	87.9	g cm-2	4.772E+04	cm
Pion interaction length	120.8	g cm-2	6.555E+04	cm
Radiation length	36.20	g cm-2	1.965E+04	cm
Critical energy	86.17	MeV (for e-)	84.25	MeV (for e+)
Molière radius	8.91	g cm-2	4835.	cm
Plasma energy	0.87	eV
Muon critical energy	1095.	GeV
Index of refraction (@ STP, Na D)	449.	(n-1)x106
Sublimination temperature (@ 1 atm)	194.8	K	-78.40	C

Composition:

Elem	Z	Atomic frac*	Mass frac*
C	6	2.00	0.272916
O	8	4.00	0.727084
* calculated from mass fraction data.

Explanation of some entries
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