electronic spectroscopy of carbon chains of astrophysical relevance
TRANSCRIPT
ELECTRONIC SPECTROSCOPY of
CARBON CHAINS of
ASTROPHYSICAL RELEVANCE
C HC C CC C
Electronic Spectrum ? ? ?
PMT
Laser beam
nozzle
valve
Gas inlet
cavity
HV
2 X 2
C6H, C8H, C10H, C12H
HCCH / Ar
CRDS
Dischargepulse
30 μs
Time
24480 24490 cm-1
Ab
sorb
an
ce
0.1
0.0
1.0
0.0
0.5
0.0
0.5
0.0450 500 550 600 nm
C6–
HC6H+
HC4CN+
C6H
Absorption Spectra in 5 K Neon Matrix
2 X 2
C6H
nm526.7
1/2
526.6 526.5 526.4 526.3
3/247/2
5/271/2
3/2 = 3/2
= 1/2
Gas Phase
C6H2 X 2
450 500 550
Absorption in 5 K Neon Matrix 000
CRDS
Dischargepulse
30 μs
Time
24480 24490 cm-1
DFWM
ωpump
ωprobe=
1
Λθ
θB
23 4
DFWMsignal
DFWMlaser
CRDS
DFWM
DFWM
24480 24490 cm-1
C4H
C3
Dischargepulse
Dischargepulse
Dischargepulse
9 μs
7 μs
30 μs
Time
< 1 μs
< 1 μs
Laser
1
Λθ
θB
23 4
TC-RFWM
UP
SEP
ωpump ωprobe
ωpump ωprobe
24200 24300 24400 24500
Wavenumber (cm-1)
2Σ+
2Σ+
2Π 2Σ+
2Σ+ X 2Σ+
PUMP
C4H
C2H2/He
C2D2/He
543 544 545 547546 543 544 545 547546
Inte
nsi
ty [
a.u
.|
Wavelength [nm]
H. Linnartz, N. Wehres, H. Van Winckel, G.A.H. Walker, D.A. Bohlender, A.G.G.M. Tielens, T. Motylewski and J.P. Maier, Astron. Astrophys, 511, L3, 2010
A DIB Coincidence @λ5450
200 300 400 500 600 700 nm
0.0
0.5
1.0 C C CH
H
B 1B1 X 1A 1
~~A 1A 2 X 1A 1
~~C 1A 1 X 1A 1
~~
J. A. Hodges, R. J. McMahon, K. W. Sattelmeyer, J. F. StantonAp J, 544, 838, 2000
16227
16200 16210 16220 16230 16240 16250 cm-1
16230 16233 16236 cm-1
Ka = 1-0
Ka = 0-1 Ka = 1-0 Ka = 2-1
A 1A2 X 1A1
~ ~
C C CH
H
B 1B1
A 1A2
X 1A113950 cm-1 16130 cm-1
~
~
~
C C CH
H
1A2
B2
B1
B1
1A1
b2 16233
b2 15982
b1 15813
≤ 13975
0
a- b- c-
1B1 a2 ~16161
Γstate Γv
A~
B~
X~
Γstate Γv
Vibronic interactions
Coriolis interactions
C C CH
H
C C CH
H
C C CH
H
H
Hhv
4500 5000 5500 6000
Wavelength (Å)
Ab
sorb
an
ce
202
201
203 202 401201 401
B 1B1 X 1A1
~ ~6 K Neon Matrix
A 1A2 X 1A1
~ ~
C C CD
D
C3H2+
mass-selection
5430 5450 5470 5490 4840 4880 4920
5430 5450 5470 5490 4840 4880 4920 ÅÅ
201 202
B 1B1 X 1A1
~ ~
l – C3H
CRD
201 202
C C CD
D
C C CH
H
C C CH
H
4750 4800 4850 4900 4950
Wavelength (Å)
Re
lativ
e I
nte
nsi
ty
5 %
HD 190603
HD 183143
HD 46711
γ Ori
C C CH
H
Å6235 6250 6265 6150 6160 6170 Å
Ka = 2-1
Ka = 1-0
Ka = 0-15 K
20 K
60 K
A 1A2 X 1A1
~ ~Δλ = 0.15 Å
Δλ = 0.4 ÅC C CH
H
6240 6250 6260
Wavelength (Å)
Re
lativ
e I
nte
nsi
ty
1 %
HD 206267
ζ Oph (x2.5)
HD 179406
HD 204827 (÷2)
A 1A2 X 1A1
~ ~
10 K, Δλ = 0.15 ÅC C C
H
H
C C CH
H
B 1B1 X 1A1
~ ~f ~ 0.016 (theory)
N (cm-2) = 1.13 1020
N (l–C3H2) ~ 5 1014 cm-2
EW (Å)
Λ (Å)2 f
towards HD 183143
Franck-Condon factor 20 ~ 0.2 total 1
f (20) ~ 0.0031
Magnetic Bender Quadrupole 22-Pole Trap (6 K) HV ElectrodeQuadrupole
Ion source Hexapole Helium Inlet LaserPhotomultiplierLenses
D 2Πu
B 2Σu+
A 2Σg+
C 2Πu
X 2Πg
33 409
17 363
11 253
9 342
E / cm-1
~ 33 000 C2+ + N2
NCCN+
D 2Πu
B 2Σu+
A 2Σg+
C 2Πu
X 2Πg
33 409
17 363
11 253
9 342
E / cm-1
~ 33 000 C2+ + N2
UV
NCCN+
750 800 850 900 nm
NCCN+
000
502
402
201 50 / 40
2 4
202
101
*
*
*
B 2 Σu+ X 2 Πg
201
887.5 888.0 888.5 889.0 nm
NCCN+
B 2Σu+ – X 2Π3/2,g
000
NCCN+
~ 890 nm
355 nm
NC+ + CN
ps
C 2Πu
B 2Σu+
A 2Σg+
X 2Πg
~ 2000 cm-1
840 860 880 900 920 nm
HCCCCCCCCCCCCH+
000
A 2u X 2 g
1200
16141210864
1000
800
600
400n
nm
B 2Πg
A 2Πg
C 2Πg
X 2Πu
3
2
1
0
E/eV HC10H+
C7H2+ + C3
C7H+ + C3H
B 2Πg
A 2Πg
C 2Πg
X 2Πu
3
2
1
0
E/eV HC10H+
C7H2+ + C3
C7H+ + C3H
17656 17660 17664 17668 15460 15464 15468 ν/cm -1
17610 18640 18660 ν/cm -117640 17670 17700 17730 18620
HC8H+ B 2Πu X 2Πg 000 HC10H+ B 2Πg X 2Πu 00
0
HC10H+ C 2Πg X 2Πu 000 HC12H+ D 2Πu X 2Πg 00
0
~
~
480 485 490 495 500 505 nm
50
100
150
200
250
300
350
400
C4H
+ c
oun
ts00
0
HC4H+
A 2Πu X 2Πg
~ ~
35
30
25
20
15
10
5
0507.1 506.7 506.9506.7 506.9 nm
Simulation~ 20 K; 0.4 cm-1
5066 5068 5070 5072 Å
5068.8 Å DIB
10 K
60 K
000HC4H+ A 2Πu X 2Πg
~ ~
J. Krelowski et al., Ap. J., 714, L64, 2010
A 2Π3/2 v3 = 1
A 2Π1/2 v = 0
A 2Π3/2 v = 0
X 2Π1/2 v = 0
X 2Π3/2 v = 0
~ 800 cm-1
31.1 cm-1
33.3 cm-1 Magnetic dipole rate ~10-6 s-1
R1m
ax
~5
06
7.9
Å
H C C C C H+
A 2Πu X 2Πg
~~H C C C C H
+
5055 5060 5070 5075
Wavelength (Å)
30 K
60 K
60 K
30 K
5065 5080
2Π3/2 and 2Π1/2
2Π3/2
Trot = Ts-o
DIB‘s
2Π3/2
2Π1/2
~ 33 cm-1 Magnetic dipole
000
M.D. Morse & J.P. Maier, Ap J, 731, 1, 2011
Dr. Rainer DIETSCHE
PD Dr. Jan FULARA
Dr. Fabio MAZZOTTI
Dr. Corey RICE
Satrajit CHAKRABARTY
Iryna GARKUSHA
Adam NAGY
Ranjini RAGHUNANDAN
M.D. Morse & J.P. Maier, Ap J, 731, 1, 2011
M.D. Morse & J.P. Maier, Ap J, 731, 1, 2011