Zeitschrift for Physik A

Z. Phys. A - Atoms and Nuclei 322, 349-350 (1985)

A.{.r~n,'~c~

/-IL~l

I I0

and Nuclei 9 Springer-Verlag 1985

Short Note Hyperfinestructure and Lifetime of the Mn I Levels 3dS4s4p z4P3/2, s/z with Laser-Atomic-Beam-Spectroscopy H.-D. Kronfeldt, J.-R. Kropp, A. Subaric, and R. Winkler Optisches Institut, Technische Universit~it Berlin, Strasse des 17. Juni 135, D-1000 Berlin, Germany Received August 5, 1985

ABSTRACT

w e a k and s h o u l d be

With laser-atomic-beam-spectroscopy hyperfinestructure

the

s p l i t t i n g c o n s t a n t s A,

highest possible

investigated with

resolution,

the use of a p u l s e d dye laser.

B and the l i f e t i m e s

T of the Mn I l e v e l s

addition

3d54s4p

were

m i n a t i o n of the l i f e t i m e

z 4P3/2,5/2

the UV i n t e r c o m b i n a t i o n

determined lines

and 322,5 nm. We o b t a i n e d : B = -40(30)MHz,

from

321,7 n m

A = -821(3)MHz,

T = 1120(50)nsec

for the

necessitated This

- in

- s h o u l d a l s o p e r m i t the d e t e r T of the two le-

vels w h i c h are of a s t r o p h y s i c a l

interest,

too.

EXPERIMENTS

J = 3/2 level and A = - 6 0 7 , 8 ( 1 , 5 ) M H z , The f r e q u e n c y - d o u b l e d B = +75(15)MHz,

T = 970(50)nsec

l i g h t of a N d - Y a g -

for the laser pumped a dye-laser-system

(modified

J = 5/2 level. H~nsch

type / 6 / ) e m i t t i n g

the D C M - d y e .

INTRODUCTION

This pulsed laser light

(15 nsec p u l s e w i d t h , In the p a s t f e w y e a r s is b e c o m i n g

increasingly

astrophysics,

e.g.

stellar abundances interest

in

resonance

(e.g.

/2/,

/I/. Of s p e c i a l se-

were already

/3/). W h e r e a s

l i n e s f r o m the m u l t i p l e t

the

terms

w e r e a l r e a d y the sub-

ject of s e v e r a l

studies

in /2/),

(see c o m p i l a t i o n

/3/,/4/ /2/,/5/ e s t i m a t e s e x i s t

only rough experimental

and t h e o r e t i c a l

for the hfs of the z 4p m u l t i p l e t .

was a l s o f r e q u e n c y - d o u b l e d

a t o m s w h i c h was p r o d u c e d h e a t e d oven.

in a r e s i s t a n c e

t e c t e d at the e x c i t a t i o n w a v e l e n g t h s

a boxcar averager, two g a t e d

(type P.A.R.

integrators,

whole experiment

- i.e.

(type

4P5/2

§

interferomethe d a t a - i n -

put etc.

- was c o n t r o l l e d by a P S I - 8 0

microcomputer

/7/.

To

of the two i n t e r c o m (4s4p z 4 P 3 / 2

and I = 322,5 nm

2 a 6S5/2).

165). The

ter for the p r e s s u r e marks,

For the h f s - i n v e s t i g a t i o n s

z

with

the d y e - l a s e r u s i n g a J a m i n

ly the h f s - s p l i t t i n g

§ 4s 2 a 6S5/2)

162)

the s c a n n i n g of

INVESTIGATION AND DISCUSSION

lines I = 321,7 n m

with

(RCA 31000 A) a n d

c l o s e this gap we m e a s u r e d very a c c u r a t e -

bination

and

The U V f l u o r e s c e n c e was de-

a fast p h o t o m u l t i p l i e r

z 6p, Y 6p a n d z 8p to the g r o u n d -

3d54s 2 a 6S5/2

rate)

10 Hz r e p e t i t i o n

c r o s s e d a c o l l i m a t e d a t o m i c - b e a m of Mn-

for the a n a l y s i s of etc.

investigations

c a r r i e d out

state

important

is the e l e m e n t Mn for w h i c h

veral hfs

3d54s4p

the e f f e c t of hfs

red l i g h t f r o m

(4s4p

The fact t h a t

these l i n e s lie in the UV, are r a t h e r

dye-laser

citation modes e m p l o y i n g the ciple"

we u s e d the

in v a r i o u s h i g h r e s o l u t i o n (halfwidth

h 100 MHz) ,

"double F a b r y - P e r o t

/6/ w i t h

ex-

prin-

spacers ranging from

350

H-D. Kronfeldt et al: Hyperfinestructure and Lifetime of the Mn I Levels results

,k 322,5nm

obviously

more e x t e n d e d

show that a new and

theoretical

analysis

fs and hfs for the c o m p l e t e 3d54s4p

is

of the

configuration

required.

z

x_

For the l i f e t i m e dye-laser (A~30

in a b r o a d b a n d

GHz),

ic g r a t i n g

J

rescence -3

-1,5

0

15

3--.-.,..~D{GHZ]

measurements

excitation

as s e l e c t i v e

element.

The fluo-

was d e t e c t e d by means of a gate

experimental included

mode

i.e. with only a h o l o g r a p h -

of 5 nsec with a v a r i a b l e

Fig.l: H f s - s p l i t t i n g - e x p e r i m e n t a l points (+), c o m p u t e r f i t t i n g curve (-) and error curve about the a b s c i s s a

we used the

lifetimes

in Table

time-delay.

T

The

obtained

are

exp I, too. They are r a t h e r

large which was to be e x p e c t e d b e c a u s e 1,2 mm to 16 mm for the internal Perot and from external

16 mm to 32 mm for the

interferometer.

the h f s - s p l i t t i n g good a g r e e m e n t

between

sent

in Fig.1.

time in r e l a t i o n

in c w - l a s e r

constants

state

splitting

of

/8/. They are given

I. It is seen that a very good accuracy

of b e t t e r

than

for the A

stants.

also

For c o m p a r i s o n

-conexp i n c l u d e d in

1 are the t h e o r e t i c a l l y

hfs-constants

deduced

of /2/ and /5/. The devia-

tion of the t h e o r e t i c a l

Atheo-COnstants

for both levels may be c a u s e d by the fact that the w a v e f u n c t i o n s figuration so far, mixture

still are not yet of the needed.

Y 6p term,

influence

should

on the

into a c c o u n t

In /9/ a c o n s i d e r a t i o n

influence

but did not r e s u l t provement.

the ad-

3d64p

mainly

a fact not taken

by /2/ and /5/.

suffi-

Especially

of the c o n f i g u r a t i o n

have a strong

of this

of the con-

3d54s4p which had to be used

cient accuracy

h i g h e r but

however,

(Table

gf-values

compiled

figures

are

fig-

I) w h i c h

by /10/ e m p l o y i n g

These c a l c u l a t e d

the se-

in /11/.

slightly

show the same tendency.

of about

A dif-

25 % may be regarded,

as a r a t h e r

the d i s c u s s i o n

A

0,5 % c o u l d be r e a c h e d

Table

ab-

and exp were e v a l u a t e d

of the two 4 p - l e v e l s exp taking a c c o u n t of the small

experimental

miempirical

ference

of the long life-

B

in Table

The

entirely

theoretical

good a g r e e m e n t

of atomic

in

lifetimes.

to the p u l s e w i d t h ) .

The hfs s p l i t t i n g

the Mn g r o u n d

were c a l c u l a t e d

that h y p e r f i n e -

- is o b v i o u s l y

(mainly b e c a u s e

AS # 0. For c o m p a r i s o n

ures Ttheo are also given

of

the e x p e r i m e n t a l

- often o b s e r v e d

applications

An e x a m p l e

is shown

data and the fit p r o v e s pumping

Fabry-

of 3d64p was attempted, in a s i g n i f i c a n t

Therefore,

im-

our e x p e r i m e n t a l

z 4P3/2

z 4P5/2

-821(3) -930 -887.6

-607~8(I,5) -780 -634.8

this work /2/ /5/

B

-40(30) -51.4

+75(15) +64.7

this work /5/

Tex p Ttheo

1120(50) 1473

970(50) 1190

this work /11/

A exp Atheo

literature

Table I: E x p e r i m e n t a l and t h e o r e t i c a l h f s - s p l i t t i n g c o n s t a n t s (MHz) and lifetimes (nsec) LITERATURE /I/ A.J. Booth, D.E. B l a c k w e l l , Mon.Not. R.astr. Soc., 204, 777(1983) /2/ T.G.R. Beynon, Astron. and A s t r o phys., 61, 853(1977) /3/ A.J. Booth, M.J. Shallis, M. Wells, Mon.Not. R . a s t r . S o c . , 205, 191(1983) /4/ R.A. Fisher, E.R. Peck, Phys.Rev., 55, 270(1939) /5/ E. Handrich, A. Steudel, H. Walther, Phys.Lett., 29A, No.8 (1969) /6/ H.-D. K r o n f e l d t , thesis D83 (1979) /7/ H.-D. K r o n f e l d t , S. W a s s e r r o t h , C o m p . E n h . S p e c t r . , I, 89(1983) /8/ L. Goodman, G. N~ideke, H. W a l t h e r , Z.Phys. 167, 26(1962) /9/ P. Luc., Physica, 62, 239 (1972) /10/ M. K w i a t k o w s k i , p r i v . c o m m u n . (1985) /11/ R.L. Kurucz, E. P e y f r e m a n n , S m i t h s o n . Astr.Obs.Cambr., Spec.Rep.362(1975)