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Hydrogen-only Saha equation
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)
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Physics
Branch of physics
Cosmology
Cosmological recombination
Free-electron fraction during hydrogen--helium recombination
Coupled hydrogen--helium Saha equations
Created
2026-09-24
Updated
2026-09-24
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When
Y
p
=
0
,
F
=
X
H
+
, and
1
−
X
H
+
X
H
+
2
=
n
B
1
(
h
2
2
π
m
e
k
B
T
)
3/2
e
−
I
H
/
(
k
B
T
)
.
(1)
Ancestors
(7)
Coupled hydrogen--helium Saha equations
Free-electron fraction during hydrogen--helium recombination
Cosmological recombination
Cosmology
Branch of physics
Physics
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Hydrogen ionization fraction
Past exam of the mathematics course of the University of Cambridge
/
2004
/
iii
/
Paper 56
/
2
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2013
/
iii
/
Paper 48
/
2
/
a
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2025
/
ii
/
Paper 3
/
14E
/
b
/
iii
/
Solution
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