Two silicon-bearing carbon chain radicals, SiC2N and SiC3N, were detected in the laboratory by Fourier transform microwave spectroscopy. Molecular constants including the hyperfine coupling constants have been determined for the two radicals in the ground electronic states. The SiC2N and SiC3N radicals have linear structures in the 2Π ground electronic states with inverted and regular fine structures, respectively, as are the cases for their isoelectronic radicals, SiC3H and SiC4H, indicating that the SiCnN radicals have similar electronic structures to the SiCn+1H radicals. The electronic structures of SiC2N and SiC3N in the ground states are discussed on the basis of the experimentally determined molecular constants.

1.
R. W.
Wilson
,
A. A.
Penzias
,
K. B.
Jefferts
,
M.
Kutner
, and
P.
Thaddeus
,
Astrophys. J.
167
,
L97
(
1971
).
2.
M.
Morris
,
W.
Gilmore
,
P.
Palmer
,
B. E.
Turner
, and
B.
Zuckerman
,
Astrophys. J.
199
,
L47
(
1975
).
3.
B. E.
Turner
,
Astrophys. J.
388
,
L35
(
1992
).
4.
J.
Cernicharo
,
C. A.
Gottlieb
,
M.
Guélin
,
P.
Thaddeus
, and
J. M.
Vrtilek
,
Astrophys. J.
341
,
L25
(
1989
).
5.
P.
Thaddeus
,
S. E.
Cummins
, and
R. A.
Linke
,
Astrophys. J.
283
,
L45
(
1984
).
6.
A. J.
Apponi
,
M. C.
McCarthy
,
C. A.
Gottlieb
, and
P.
Thaddeus
,
Astrophys. J.
516
,
L103
(
1999
).
7.
M.
Ohishi
,
N.
Kaifu
,
K.
Kawaguchi
,
A.
Murakami
,
S.
Saito
,
S.
Yamamoto
,
S.
Ishikawa
,
Y.
Fujita
,
Y.
Shiratori
, and
W. M.
Irvine
,
Astrophys. J.
345
,
L83
(
1989
).
8.
M.
Guélin
,
S.
Muller
,
J.
Cernicharo
,
A. J.
Apponi
,
M. C.
McCarthy
,
C. A.
Gottlieb
, and
P.
Thaddeus
,
Astron. Astrophys.
363
,
L9
(
2000
).
9.
M.
Guélin
,
S.
Muller
,
J.
Cernicharo
,
M. C.
McCarthy
, and
P.
Thaddeus
,
Astron. Astrophys.
426
,
L49
(
2004
).
10.
A.
McKellar
,
Publ. Astron. Soc. Pac.
52
,
312
(
1940
).
11.
M.
Guélin
and
P.
Thaddeus
,
Astrophys. J.
212
,
L81
(
1977
).
12.
M.
Guélin
,
N.
Neininger
, and
J.
Cernicharo
,
Astron. Astrophys.
335
,
L1
(
1998
).
13.
T. C.
Smith
,
H.
Li
, and
D. J.
Clouthier
,
J. Am. Chem. Soc.
121
,
6068
(
1999
).
14.
T. C.
Smith
,
H.
Li
,
D. J.
Clouthier
,
C. T.
Kingston
, and
A. J.
Merer
,
J. Chem. Phys.
112
,
3662
(
2000
).
15.
A. J.
Apponi
,
M. C.
McCarthy
,
C. A.
Gottlieb
, and
P.
Thaddeus
,
Astrophys. J.
536
,
L55
(
2000
).
16.
M. C.
McCarthy
,
A. J.
Apponi
,
C. A.
Gottlieb
, and
P.
Thaddeus
,
J. Chem. Phys.
115
,
870
(
2001
).
17.
D. L.
Kokkin
,
N. J.
Reilly
,
R. C.
Fortenberry
,
T. D.
Crawford
, and
M. C.
McCarthy
,
J. Chem. Phys.
141
,
044310
(
2014
).
18.
Y.
Ohshima
and
Y.
Endo
,
J. Mol. Spec.
172
,
225
(
1995
).
19.
C. A.
Gottlieb
,
E. W.
Gottlieb
,
P.
Thaddeus
, and
H.
Kawamura
,
Astrophys. J.
275
,
916
(
1983
).
20.
M. C.
McCarthy
,
G. W.
Fuchs
,
J.
Kucera
,
G.
Winnewisser
, and
P.
Thaddeus
,
J. Chem. Phys.
118
,
3549
(
2003
).
21.
Y.
Kasai
,
Y.
Sumiyoshi
,
Y.
Endo
, and
K.
Kawaguchi
,
Astrophys. J.
477
,
L65
(
1997
).
22.
G.
Maier
,
H. P.
Reisenauer
,
H.
Egenolf
, and
J.
Glatthaar
,
Eur. J. Org. Chem.
1998
,
1307
(
1998
).
23.
M.
Fukushima
and
T.
Ishiwata
,
J. Phys. Chem. A
117
,
9435
(
2013
).
24.
Y. H.
Ding
,
Z. S.
Li
,
X. R.
Huang
, and
C. C.
Sun
,
J. Phys. Chem. A
105
,
5896
(
2001
).
25.
H. L.
Liu
,
X. R.
Huang
,
G. H.
Chen
,
Y. H.
Ding
, and
C. C.
Sun
,
J. Phys. Chem. A
108
,
6919
(
2004
).
26.
R. A.
Frosch
and
H. M.
Foley
,
Phys. Rev.
88
,
1337
(
1952
).
27.
C. H.
Townes
and
A. L.
Schawlow
,
Microwave Spectroscopy
(
Dover
,
New York
,
1975
), p.
245
.
28.
M. J.
Frisch
,
G. W.
Trucks
,
H. B.
Schlegel
 et al, GAUSSIAN 03, Revision E.01, Gaussian, Inc., Pittsburgh, PA,
2003
.
29.
H.-J.
Werner
,
P. J.
Knowles
,
F. R.
Manby
,
M.
Schütz
 et al, MOLPRO, version 2012.1, a package of ab initio programs,
2012
, see http://www.molpro.net.
30.
M.
Iida
,
Y.
Ohshima
, and
Y.
Endo
,
J. Chem. Phys.
94
,
6989
(
1991
).
31.
Y.
Endo
,
H.
Kohguchi
, and
Y.
Ohshima
,
Faraday Discuss.
97
,
341
(
1994
).
32.
Y.
Sumiyoshi
,
H.
Katsunuma
,
K.
Suma
, and
Y.
Endo
,
J. Chem. Phys.
123
,
054324
(
2005
).
33.
J. R.
Morton
and
K. F.
Preston
,
J. Magn. Res.
30
,
577
(
1978
).
You do not currently have access to this content.