Atomic and nuclear properties of ethylene (C₂H₄)

Quantity	Value	Units	Value	Units
<Z/A>	0.57034
Specific gravity (20° C, 1 atm)	1.175E-03	g cm-3
Mean excitation energy	50.7	eV
Minimum ionization	2.174	MeV g-1cm2	2.555E-03	MeV cm-1
Nuclear collision length	56.1	g cm-2	4.776E+04	cm
Nuclear interaction length	78.5	g cm-2	6.679E+04	cm
Pion collision length	83.7	g cm-2	7.125E+04	cm
Pion interaction length	110.4	g cm-2	9.393E+04	cm
Radiation length	44.77	g cm-2	3.811E+04	cm
Critical energy	126.75	MeV (for e-)	124.06	MeV (for e+)
Molière radius	7.49	g cm-2	6375.	cm
Plasma energy ℏωp	0.75	eV
Muon critical energy	1508.	GeV

Composition:

Elem	Z	Atomic frac*	Mass frac
H	1	4.00	0.143711
C	6	2.00	0.856289
* calculated from mass fraction data

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