Download - Introductory remarks
Introductory remarks
Takeshi Oka
Department of Astronomy and Astrophysicsand Department of Chemistry,
The Enrico Fermi Institute, the University of Chicago
The Royal Society Discussion Meeting and Satellite Meeting
Kavli Centre, February 9, 2012
Thomson, J. J. 1911 Rays of positive electricity. Phil. Mag. 21, 225-249. Thomson, J. J. 1912 Further experiments on positive rays. Phil. Mag. 24, 209-253.
H3+
Chemistry, astronomy andphysics of H3+
Takeshi OkaMats LarssonSteve MillerStephan Schlemmer
Secretary Ben McCallTracey Wheeler
0
2000
4000
6000
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10000
12000
14000En
ergy
(cm-1
)
23
22
23
2
20
22
21
20
24
21
25
1
1+2
1+2
1
1
1+2
1+2
1+220 2
22
4 26
1+ 2
1+20
1+22
1+ 2
1+ 2
Session 1, Spectroscopy and Theory
Gottfried et al. 2003
1+ 24
Morong et al. 2009
Oka 1980
Bawendi et al. 1990Xu et al. 1992
McCall et al. 2000
Majewski et al. 1987
0
2000
4000
6000
8000
10000
12000
14000
Ener
gy (c
m-1 )
23
22
23
2
2022
21
20
242125
1
1+2
1+2
1
1
1+2
1+2
1+220 2224 26
1+ 2
1+201+22
1+ 2
1+ 2
1+ 24
16000
Morong, Gottfried, Oka 2009, JMS, 255, 13
Photon counting
Session 1, Spectroscopy and Theory
Pavanello, et al. 2012, Phys. Rev. Lett. 108, 023002
< 10-6 Eh
10-8 Eh
8ν22
Ion counting Petrignani, RSDMν1+ 6ν2
2ν1+ 6ν2
4 2ν1+ 5ν21
3ν1+ 4ν22?
Adamowicz RSDMPolyansky RSDM
Shy, Amano SM, PSub-Doppler
Jaquet SMnon-adiabatic corr.
H3+ + O2 → H2 + HO2
+
H3+ + N2 → H2 + HN2
+
Session 2, Chemistry
ortho-H3+, para-H3
+
Nizkorodov et al. 1997 CPL, 278, 26He-HO2+, Ne-HO2
+Widucus Weaver et al. 2009 ApJ, 697, 601
Crabtree, Tom, McCall, 2011, J. Chem. Phys. 134, 194310Crabtree et al. 2011, J. Chem. Phys. 134, 194311Crabtree et al. 2011, ApJ, 729:15 (12pp)
Schlemmer RSDM
McCall RSDM
H+ + H2 → H3+ + hν Plasil SM
H3+ trapping noble gas Pauzat SM
Mousis SM
p
Session 3, Dissociative recombination
L = 2 ke N(H3+) (nC/nH)SV RX / f(H2)
Oka et al. 2005, ApJ, 632, 882
104 → 3 McCall et al. 2004, PR A70, 052716Petrignani et al. 2011, PR A83, 032711
20 – 30 K380 K
Help!!! Theory for H3+ Recombination Badly Needed
Cosmic ray ionization rate
Oka 2001Kokooline, Greene, Esry, 2001, Nature, 412, 891Kokooline, Greene, 2003, Phys. Rev. Lett. 90, 133201Kokooline, Greene, 2003, Phys. Rev. A68, 012703
Cloud length
Jungen, Pratt, 2009, Phys. Rev. Lett. 102, 023201
Larsson RSDM
Kreckel RSDM
Johnsen SM
ortho-H3+, para-H3
+
H3+ + e˗ → H + H + H, H2 + H
Glosik SM
Jungen RSDM
Cation + anion Thomas SM H3O+ CH3+ NH4
+ Douguet PD3
+ Dohnal P
Session 4, H3+ as best Probe for Cosmic Rays
ζ 7 × 10-18 s-1Spitzer Tomasko 1968
H → H+ HD, OHH2 → H2
+ H3+
H+ + e- → H + hν
H3+ + e- → H + H + H
Dense cloud ζL = (0.32 – 1.50) × 102 cm s-1
Diffuse cloud ζL = (0.48 – 4.40) × 104 cm s-1
Galactic center ζL > (1.2 – 6.3) × 105 cm s-1
Indriolo et al. 2007 ApJ, 671,1736Indriolo, McCall, 2012, ApJ, 745, 91
McCall et al. 1999, ApJ, 522, 3383 × 10-17 s-1
5 × 10-16 s-1
> 2 × 10-15 s-1
Black RSDM Indriolo RSDM
Session 5, Galactic center
Oka et al. 2005, ApJ, 632, 882Goto et al. 2008, ApJ, 688, 306Geballe, Oka, 2010, ApJ, 709, L70
T ~ 250 Kn < 100 cm-3
Geballe RSDM Goto SM
H3+ warm diffuse cloud
H3O+ hot dense cloudT ~ 700 Kn ~ 104 cm-3
Lis RSDM
Active Galactic NucleusMeijerink SM
Session 6, Interstellar Chemistry
H2
H2+
H-
H3+
(H2-)
Geballe & Oka, 2010, ApJ, 709, L70
H3+ R(1,1)l
H2O+ 111← 000
H2O+ 110← 101
Schilke et al. 2011, A&A, 521, L11
Gerin RSDMSchilke SM
H3+ + HD → H2 + H2D+ + 232 K
H2D+ + HD → H2 + HD2+ + 187 K
HD2+ + HD → H2 + D3
+ + 234 KRobert, Herbst, Millar, 2003, ApJL 591, L41
Van der Tak RSDMPagani RSDM
Session 7, Planetary ionosphere
Io, Volcano
H3+ aurora
H3+ aurora
Oka, Rev. Mod. Phys. 1992, 64, 1141 Stallard RSDM
H2+ H3
H3˗
H5+
Black RSDM
Kokoouline SM
Prosmiti SM Valdes P
Other hydrogenic species
H7+ Prosmiti P
H4+ in solid Ne Correnti P
H6+ in solid H2
Kumagai P