Abstract
Measurement of the rotational spectra of H0
2
and HO by laser magnetic resonance has been used to determine rate coefficients for reactions of H0
2
in a fast flow system at low pressures and ambient temperatures. Processes of atmospheric importance were studied and the rate coefficients obtained were:
O
+
H
O
2
=
HO
+
O
2
,
k
4
=
(
3.1
±
1.0
)
×
10
−
11
c
m
3
molecul
e
−
1
s
−
1
,
(4)
HO
+
H
O
2
=
H
2
O
+
O
2
,
k
8
=
(
5.1
±
1.7
)
×
10
−
11
c
m
3
molecul
e
−
1
s
−
1
,
(8)
NO
+
H
O
2
=
N
O
2
+
HO
,
k
2
=
(
8.2
±
2.4
)
×
10
−
12
c
m
3
molecul
e
−
1
s
−
1
,
(2)
H
O
2
+
Cl
=
HCl
+
O
2
,
k
17
=
(
4.1
±
1.4
)
×
10
−
11
c
m
3
molecul
e
−
1
s
−
1
,
(17)
H
O
2
+
Cl
=
HO
+
ClO
,
k
17
a
≤
3
×
10
−
13
c
m
3
molecul
e
−
1
s
−
1
,
(17a)
H
O
2
+
S
O
2
=
HO
+
S
O
3
,
k
21
≤
2
×
10
−
17
c
m
3
molecul
e
−
1
s
−
1
,
(21)
H
O
2
+
S
O
2
+
He
=
H
O
2
S
O
2
+
He
,
k
21
a
≤
4
×
10
−
34
c
m
6
molecul
e
−
1
s
−
1
,
(21a)
H
O
2
+
CO
=
HO
+
C
O
2
,
k
22
≤
2
×
10
−
17
c
m
3
molecul
e
−
1
s
−
1
,
(22a)
H
O
2
+
CO
+
He
=
HC
O
3
+
He
,
k
22
a
≤
4
×
10
−
34
c
m
6
molecul
e
−
2
s
−
1
.
. The disproportionation of two H0
2
radicals was shown to proceed more slowly in argon carriers at total pressures around 2 Torr than had been reported at higher total pressures. Upper limits for k19 were HO
2
+HO
2
= H
2
O
2
+O
2
found to lie in the range (7.5 ± 5.0) x 10
-13
cm
3
molecule
-1
s
-1
.
Reference33 articles.
1. B ecker K . H . F in k E . H . L angen P . & S ch u rath U. 1974 J . chem. P hys. 60 4623.
2. B enson S. W . i960 F oundations of chemical kinetics. New Y o rk : M cGraw-Hill.
3. B roderick A. J . 1977 Proc. A I A A / S A E 13th Propulsion
4. Chem. P hys;Peyerim S. D.;Lett.,1976
5. N ature;Lond.,1977
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