Dipole Moment of Thionitrosylchloride

Dipole Moment of Thionitrosylchloride

A . GUARNIERI * A b t e i l u n g C h e m i s c h e P h y s i k

i m Institut f ü r P h y s i k a l i s c h e C h e m i e d e r Universität K i e l ( Z . N a t u r f o r s d i . 26 a, 1246 [ 1 9 7 1 ] ; received 20 A p r i l 1971)

The microwave spectrum of Thionitrosylchloride, NSC1, has been investigated by

and

M O R I N O 1

who determined the rotational constants, the structure and the force constants.

In the present work the dipole moment is determin- ed. A sample of N

S

C1

was kindly given to me by Dr. J.

of the University of Göttingen: NSC1 is than obtained by heating the N

S

C1

to 50 °C under high vacuum. The measurement has been made with a conventional 100 kHz Stark modulated spectrometer with automatic frequency markers

; frequency mea- surements are believed to be accurate within ± 0.03 MHz.

The electric field was calibrated by means of the / = l - > / ' = 2 transition of OCS using the value of 0.7152

D for the dipole moment.

The measurements have been performed on the / = 0

W = l u line at 45,460.22 MHz in the high field approximation and further on the F= 7/2 F' — 7/2 hyperfine line at 38,360.62 MHz of the J = 2

-> / ' = 2

transition and the F = 9/2 - > F' = 9/2 hyperfine line at

T a b l e 1. M e a s u r e d a n d c a l c u l a t e d s l o p e s Av/E2

in M H z / ( V / c m )2.

Jk-1, äi —*• J'k' -i, Ai'

2O.2~>2I,I 3O,3 - » - 3I,2

F-+F' Av/E

o b s . c a l c . 7 / 2 7 / 2 2 . 2 1 2 ± 0 . 0 5 2 . 2 1 8 9 / 2 9 / 2 1 . 6 8 8 ± 0 . 0 2 0 1 . 6 8 4

MjMi-+M/,Mf

Oo,0->ll,l

oil/2 Z 0 J / 2 } 1-527 ±0.015 1.532

a M e a s u r e d in h i g h field c o n d i t i o n . yWa I = 0 . 5 7 ± 0 . 0 3

^ b l = 1 . 7 7 ± 0 . 0 2

> t o t | = 1 . 8 7 ± 0 . 0 2

T a b l e 2. V a l u e s f o r the t w o c o m p o - n e n t s a n d f o r t h e total e l e c t r i c di-

p o l e m o m e n t in D e b y e .

38,933.92 MHz of the / = 3

- > / ' = 3

transition whose Stark Effect is independent of the quadrupole energy.

In Table 1 the measured and calculated slopes for these lines are given, and in Table 2 the dipole moment components along the two principal axes of inertia and the total dipole moment are listed.

r " - I t h a n k P r o f . D r . H . DREIZLER f o r t h e invitation t o his la- b o r a t o r y . I a m f u r t h e r g r a t e f u l t o the D e u t s c h e F o r s c h u n g s - g e m e i n s c h a f t w h i c h s u p p o r t e d this i n v e s t i g a t i o n a n d t o t h e R e c h e n z e n t r u m of t h e U n i v e r s i t y o f K i e l .

R e p r i n t s r e q u e s t t o D r . A . GUARNIERI, Institut f ü r P h y s i k a - lische C h e m i e d e r Universität K i e l , A b t . C h e m i s c h e P h y s i k , D-2300 Kiel, O l s h a u s e n t s r a ß e 4 0 / 6 0 .

* O n l e a v e : Istituto di C h i m i c a F i s i c a , U n i v e r s i t ä di P a d o v a , I t a l y .

1 T . BEPPU, E . HIROTA, and Y . MORINO, J. M o l . S p e c t r . 3 6 , 3 8 6 [ 1 9 7 0 ] .

2 H . D . RUDOLPH, Z . A n g e w . P h y s . 1 3 , 4 0 1 [ 1 9 6 1 ] .

3 H . D. RUDOLPH a n d H . SEILER, Z . N a t u r f o r s c h . 2 0 a, 1 6 8 2 [ 1 9 6 5 ] .

4 U . ANDRESEN a n d H . DREIZLER, Z. A n g e w . P h y s . 30, 2 0 7 [ 1 9 7 0 ] .

5 J. S. MUENTER, J. C h e m . P h y s . 4 8 , 4 5 4 4 [ 1 9 6 8 ] .

B E R I C H T I G U N G

Erratum. B. D. HANSON, M. MAHNIG, and Louis E. TOTH, Low Temperature Heat Capacities of Transition Metal Borides, Z. Naturforsdi. 26 a, 739 [1971].

P. 739, column 2, line 13 ff from bottom should read: There is, however, little general agreement on the number of electrons transferred per boron atom . . . ;

p. 743, Table 3, line 3: (Mn

Fe.i)

B, line 6: (Mn.iFe.g)

B , line 13: (Co.gNi.i)

B;

p. 743, Table 6, line 2:

Nachdruck — auch auszugsweise — nur m i t schriftlicher G e n e h m i g u n g des V e r l a g e s gestattet Verantwortlich f ü r d e n I n h a l t : A . KLEMM

Satz und D r u c k : K o n r a d Triltsch, W'ürzburg