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Direct experimental measurement of electron impact ionization‐excitation branching ratios 4. Branching ratios and cross sections for O 2 + at 100 eV
The 100‐eV ionization of molecular oxygen has been studied by the ( e ,2 e ) electron‐electron coincidence method. Ionization to the ground state and five excited states of O 2 + has been detected. Of these six electronic states, ionization to three, the X 2 Π g , a 4 Π u , and b 4 Σ g − states, was...
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| Published in: | Journal of Geophysical Research: Space Physics 1997-05, Vol.102 (A5), p.9691-9696 |
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| Language: | English |
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| cites | cdi_FETCH-LOGICAL-c159t-32ea1930c9a80c112cc8dadd80e1ae04182a6f6313b07b58d198ae9e209a78773 |
| container_end_page | 9696 |
| container_issue | A5 |
| container_start_page | 9691 |
| container_title | Journal of Geophysical Research: Space Physics |
| container_volume | 102 |
| creator | Doering, J. P. Yang, J. |
| description | The 100‐eV ionization of molecular oxygen has been studied by the (
e
,2
e
) electron‐electron coincidence method. Ionization to the ground state and five excited states of O
2
+
has been detected. Of these six electronic states, ionization to three, the
X
2
Π
g
,
a
4
Π
u
, and
b
4
Σ
g
−
states, was found to account for approximately 95% of the O
2
+
production. Relative triple differential cross sections for the production of O
2
+
in these three states were measured as a function of ejected electron energy, ejected electron angle, and incident electron scattering angle. Ionization to the three higher energy states,
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
, was found to be much weaker, and it was only possible to estimate the branching ratios to these states. Ionization to the
A
2
Π
u
state, the upper state of the second negative bands of O
2
+
, was not observed, as this state is only weakly excited and is overlaid by the stronger
a
4
Π
u
state. The branching ratios were found to be 0.540, 0.297, and 0.122 for the
X
2
Π
g
,
a
4
Π
g
, and
b
4
Σ
g
−
states, respectively. The total branching ratio for the
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
states was 0.042 (all values ±20%). The branching ratio to the
A
2
Π
u
state was estimated to be |
| doi_str_mv | 10.1029/96JA03997 |
| format | article |
| fullrecord | <record><control><sourceid>crossref</sourceid><recordid>TN_cdi_crossref_primary_10_1029_96JA03997</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>10_1029_96JA03997</sourcerecordid><originalsourceid>FETCH-LOGICAL-c159t-32ea1930c9a80c112cc8dadd80e1ae04182a6f6313b07b58d198ae9e209a78773</originalsourceid><addsrcrecordid>eNpdUMtOwzAQ9AEkqtIDf7BXhFLWdprYx1LeqtQLcI02zgaM2qSyg1Q48Qmc-EC-hLQgDuxlNKPZ0WiEOJI4lqjsqc1up6itzffEAGVqElQqPxCjGJ-xv3SSpSgH4vPcB3Yd8GbNwa-46WgJK6b4EnjLoK2Bl70jtA341Zp6r28b_0ZdD1_vH7xxvtsRKAM17sk3jxC2QoR0DGf_NWoqcKGNEWKf2r9FqNsAC1BwAtSBRAR-OBT7NS0jj35xKO4vL-5m18l8cXUzm84TJye2S7Riklajs2TQSamcMxVVlUGWxJhKoyirMy11iXk5MZW0htiyQku5yXM9FMc_ubtKgeti3a9A4bWQWGx3LP521N-J52lc</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Direct experimental measurement of electron impact ionization‐excitation branching ratios 4. Branching ratios and cross sections for O 2 + at 100 eV</title><source>Wiley-Blackwell AGU Digital Archive</source><creator>Doering, J. P. ; Yang, J.</creator><creatorcontrib>Doering, J. P. ; Yang, J.</creatorcontrib><description>The 100‐eV ionization of molecular oxygen has been studied by the (
e
,2
e
) electron‐electron coincidence method. Ionization to the ground state and five excited states of O
2
+
has been detected. Of these six electronic states, ionization to three, the
X
2
Π
g
,
a
4
Π
u
, and
b
4
Σ
g
−
states, was found to account for approximately 95% of the O
2
+
production. Relative triple differential cross sections for the production of O
2
+
in these three states were measured as a function of ejected electron energy, ejected electron angle, and incident electron scattering angle. Ionization to the three higher energy states,
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
, was found to be much weaker, and it was only possible to estimate the branching ratios to these states. Ionization to the
A
2
Π
u
state, the upper state of the second negative bands of O
2
+
, was not observed, as this state is only weakly excited and is overlaid by the stronger
a
4
Π
u
state. The branching ratios were found to be 0.540, 0.297, and 0.122 for the
X
2
Π
g
,
a
4
Π
g
, and
b
4
Σ
g
−
states, respectively. The total branching ratio for the
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
states was 0.042 (all values ±20%). The branching ratio to the
A
2
Π
u
state was estimated to be <1%. The cross sections for the
X
2
Π
g
,
a
4
Π
u
, and
b
4
Σ
g
−
states were calculated using the previously measured O
2
+
production cross section for 100‐eV electrons on O
2
. The results were 92.2 (±20%) × 10
−18
cm
2
, 50.8 (±20%) × 10
−18
cm
2
, and 22.1 (±20%) × 10
−18
cm
2
, respectively. The
b
4
Σ
g
−
state cross section was in satisfactory agreement with the recalculated optical fluorescence data on the O
2
+
first negative band emission cross section of 37.1 (±25%) × 10
−18
cm
2
[
McConkey and Woolsey
, 1969].</description><identifier>ISSN: 0148-0227</identifier><identifier>DOI: 10.1029/96JA03997</identifier><language>eng</language><ispartof>Journal of Geophysical Research: Space Physics, 1997-05, Vol.102 (A5), p.9691-9696</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c159t-32ea1930c9a80c112cc8dadd80e1ae04182a6f6313b07b58d198ae9e209a78773</citedby><cites>FETCH-LOGICAL-c159t-32ea1930c9a80c112cc8dadd80e1ae04182a6f6313b07b58d198ae9e209a78773</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Doering, J. P.</creatorcontrib><creatorcontrib>Yang, J.</creatorcontrib><title>Direct experimental measurement of electron impact ionization‐excitation branching ratios 4. Branching ratios and cross sections for O 2 + at 100 eV</title><title>Journal of Geophysical Research: Space Physics</title><description>The 100‐eV ionization of molecular oxygen has been studied by the (
e
,2
e
) electron‐electron coincidence method. Ionization to the ground state and five excited states of O
2
+
has been detected. Of these six electronic states, ionization to three, the
X
2
Π
g
,
a
4
Π
u
, and
b
4
Σ
g
−
states, was found to account for approximately 95% of the O
2
+
production. Relative triple differential cross sections for the production of O
2
+
in these three states were measured as a function of ejected electron energy, ejected electron angle, and incident electron scattering angle. Ionization to the three higher energy states,
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
, was found to be much weaker, and it was only possible to estimate the branching ratios to these states. Ionization to the
A
2
Π
u
state, the upper state of the second negative bands of O
2
+
, was not observed, as this state is only weakly excited and is overlaid by the stronger
a
4
Π
u
state. The branching ratios were found to be 0.540, 0.297, and 0.122 for the
X
2
Π
g
,
a
4
Π
g
, and
b
4
Σ
g
−
states, respectively. The total branching ratio for the
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
states was 0.042 (all values ±20%). The branching ratio to the
A
2
Π
u
state was estimated to be <1%. The cross sections for the
X
2
Π
g
,
a
4
Π
u
, and
b
4
Σ
g
−
states were calculated using the previously measured O
2
+
production cross section for 100‐eV electrons on O
2
. The results were 92.2 (±20%) × 10
−18
cm
2
, 50.8 (±20%) × 10
−18
cm
2
, and 22.1 (±20%) × 10
−18
cm
2
, respectively. The
b
4
Σ
g
−
state cross section was in satisfactory agreement with the recalculated optical fluorescence data on the O
2
+
first negative band emission cross section of 37.1 (±25%) × 10
−18
cm
2
[
McConkey and Woolsey
, 1969].</description><issn>0148-0227</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><recordid>eNpdUMtOwzAQ9AEkqtIDf7BXhFLWdprYx1LeqtQLcI02zgaM2qSyg1Q48Qmc-EC-hLQgDuxlNKPZ0WiEOJI4lqjsqc1up6itzffEAGVqElQqPxCjGJ-xv3SSpSgH4vPcB3Yd8GbNwa-46WgJK6b4EnjLoK2Bl70jtA341Zp6r28b_0ZdD1_vH7xxvtsRKAM17sk3jxC2QoR0DGf_NWoqcKGNEWKf2r9FqNsAC1BwAtSBRAR-OBT7NS0jj35xKO4vL-5m18l8cXUzm84TJye2S7Riklajs2TQSamcMxVVlUGWxJhKoyirMy11iXk5MZW0htiyQku5yXM9FMc_ubtKgeti3a9A4bWQWGx3LP521N-J52lc</recordid><startdate>199705</startdate><enddate>199705</enddate><creator>Doering, J. P.</creator><creator>Yang, J.</creator><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>199705</creationdate><title>Direct experimental measurement of electron impact ionization‐excitation branching ratios 4. Branching ratios and cross sections for O 2 + at 100 eV</title><author>Doering, J. P. ; Yang, J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c159t-32ea1930c9a80c112cc8dadd80e1ae04182a6f6313b07b58d198ae9e209a78773</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Doering, J. P.</creatorcontrib><creatorcontrib>Yang, J.</creatorcontrib><collection>CrossRef</collection><jtitle>Journal of Geophysical Research: Space Physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Doering, J. P.</au><au>Yang, J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Direct experimental measurement of electron impact ionization‐excitation branching ratios 4. Branching ratios and cross sections for O 2 + at 100 eV</atitle><jtitle>Journal of Geophysical Research: Space Physics</jtitle><date>1997-05</date><risdate>1997</risdate><volume>102</volume><issue>A5</issue><spage>9691</spage><epage>9696</epage><pages>9691-9696</pages><issn>0148-0227</issn><abstract>The 100‐eV ionization of molecular oxygen has been studied by the (
e
,2
e
) electron‐electron coincidence method. Ionization to the ground state and five excited states of O
2
+
has been detected. Of these six electronic states, ionization to three, the
X
2
Π
g
,
a
4
Π
u
, and
b
4
Σ
g
−
states, was found to account for approximately 95% of the O
2
+
production. Relative triple differential cross sections for the production of O
2
+
in these three states were measured as a function of ejected electron energy, ejected electron angle, and incident electron scattering angle. Ionization to the three higher energy states,
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
, was found to be much weaker, and it was only possible to estimate the branching ratios to these states. Ionization to the
A
2
Π
u
state, the upper state of the second negative bands of O
2
+
, was not observed, as this state is only weakly excited and is overlaid by the stronger
a
4
Π
u
state. The branching ratios were found to be 0.540, 0.297, and 0.122 for the
X
2
Π
g
,
a
4
Π
g
, and
b
4
Σ
g
−
states, respectively. The total branching ratio for the
B
2
Σ
g
−
,
2
Π
u
, and
c
4
Σ
u
−
states was 0.042 (all values ±20%). The branching ratio to the
A
2
Π
u
state was estimated to be <1%. The cross sections for the
X
2
Π
g
,
a
4
Π
u
, and
b
4
Σ
g
−
states were calculated using the previously measured O
2
+
production cross section for 100‐eV electrons on O
2
. The results were 92.2 (±20%) × 10
−18
cm
2
, 50.8 (±20%) × 10
−18
cm
2
, and 22.1 (±20%) × 10
−18
cm
2
, respectively. The
b
4
Σ
g
−
state cross section was in satisfactory agreement with the recalculated optical fluorescence data on the O
2
+
first negative band emission cross section of 37.1 (±25%) × 10
−18
cm
2
[
McConkey and Woolsey
, 1969].</abstract><doi>10.1029/96JA03997</doi><tpages>6</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0148-0227 |
| ispartof | Journal of Geophysical Research: Space Physics, 1997-05, Vol.102 (A5), p.9691-9696 |
| issn | 0148-0227 |
| language | eng |
| recordid | cdi_crossref_primary_10_1029_96JA03997 |
| source | Wiley-Blackwell AGU Digital Archive |
| title | Direct experimental measurement of electron impact ionization‐excitation branching ratios 4. Branching ratios and cross sections for O 2 + at 100 eV |
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