Atomic and nuclear properties of polyimide film [(C₂₂H₁₀N₂O₅)_n]

Quantity	Value	Units	Value	Units
<Z/A>	0.51264
Specific gravity	1.420	g cm-3
Mean excitation energy	79.6	eV
Minimum ionization	1.820	MeV g-1cm2	2.584	MeV cm-1
Nuclear collision length	59.2	g cm-2	41.67	cm
Nuclear interaction length	85.5	g cm-2	60.20	cm
Pion collision length	86.5	g cm-2	60.91	cm
Pion interaction length	117.4	g cm-2	82.71	cm
Radiation length	40.58	g cm-2	28.57	cm
Critical energy	81.01	MeV (for e-)	78.84	MeV (for e+)
Molière radius	10.62	g cm-2	7.479	cm
Plasma energy ℏωp	24.59	eV
Muon critical energy	1050.	GeV
Index of refraction (Na D)	1.700

Composition:

Elem	Z	Atomic frac*	Mass frac
H	1	10.00	0.026362
C	6	22.00	0.691133
N	7	2.00	0.073270
O	8	5.00	0.209235
* 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
Note: DuPont's Kapton is poly-oxydiphenylene-pyromellitimide