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Submitted on 1 Jan 1983
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ATOMIC ANALYSIS INSTRUMENT USING OPTOGALVANIC SPECTROSCOPY
Th. Berthoud, P. Camus, N. Drin, J. Stehle
To cite this version:
Th. Berthoud, P. Camus, N. Drin, J. Stehle. ATOMIC ANALYSIS INSTRUMENT USING OPTO- GALVANIC SPECTROSCOPY. Journal de Physique Colloques, 1983, 44 (C7), pp.C7-389-C7-391.
�10.1051/jphyscol:1983737�. �jpa-00223294�
JOURNAL D€ PHYSIQUE
Colloque C7, suppl6ment au n o l l , Tome 44, novembre 1983 page C7-389
ATOMIC ANALYSIS INSTRUMENT USING OPTOGALVANIC SPECTROSCOPY
Th. Berthoud, P. camus*, N. D r i n and J . L . s t e h l e r *
Centre dlEtudes Nuele'aires, 92260 Fontenay-am-Roses, France ' ~ a b o r a t o i r e
Aim&Cotton, CNRS, 92405 Orsay Cedex, France
**SOPRA,
92270 Bois-CoZombes, France
Resum6 : On d 6 c r i t un i n s t r u m e n t d ' a n a l y s e atomique u t i l i s a n t l ' e f f e t o p t o g a l v a n i q u e . L ' e x c i t a t i o n e s t o b t e n u e p a r 2 L a s e r s 2 C o l o r a n t s pomp& p a r excimi3-e. On donne l e s r e s u l t a t s p r d l i m i n a i r e s d & j g o b t e n u s
.
A b s t r a c t : An Atomic A n a l y s i s I n s t r u m e n t u s i n g o p t o g a l v a n i c s p e c t r o s c o p y is d e s c r i b e d . The e x c i t a t i o n is p r o v i d e d by 2 excimer pumped dye l a s e r s . P r e l i m i n a r y r e s u l t s a r e g i v e n .
S i n c e a few y e a r s o p t o g a l v a n i c s p e c t r o s c o p y h a s been u s e d f o r a n a l y t i c a l p u r p o s e s i n f l a m e a t o m i c s p e c t r o s c o p y ( 1 , 2 ) . An O.G.S. i n s t r u m e n t w i l l be d e s c r i b e d which a l l o w e d u s , f i r s t t o s t u d y fondamental phenomenom i n v o l v e d i n e l e c t r o n s c o l l e c t i o n p r o c e s s ; e f f i c i e n c y and p u l s e s h a p e a n a l y s i s ( 3 ) , t h e n t o t e s t c a p a b i l i t i e s i n t r a c e a n a l y s i s i n s i m p l e m a t r i x .
T a b l e T shows f i r s t r e s u l t s o b t a i n e d w i t h t h i s i n s t r u m e n t .
ELEMENT
.
MATRIX.
l 0 STEP nm.
2O STEP nm.
L o f DETECTIONNa
.
OIL-
589 568 2 opb*568 -2
Na
.
WATER.
589 10 ppb*Au
.
WATER.
242-
2 P P ~CO I ) 252,l
-
591,7.
0 , s ppbC r 252
-
0 ~ 2 P P ~Fe 2 49 589 094 P P ~
Ga 250
-
1 PPbPb 247 1 0 P P ~
*
Blank backgroundT a b l e I
The e x c i t a t i o n is p r o v i d e d by 2 dye l a s e r s pumped by a n excimer l a s e r which
a p p e a r e d t o b e t h e b e s t c h o i c e c o n s i d e r i n g peak and a v e r a g e powers
, A
of e x c i t a t i o n , p r i c e and e a s e o f u s e ( s e e t a b l e 1 1 ) .Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1983737
C7-390 JOURNAL DE PHYSIQUE
EXPERIMENTAL SET UP
EXCIMER LASER
' ^
T U N I W GX TUNING
DYE LASER X 2., DYE LASER
OSCILLATOR OSCILLATOR AMPLIFIER y~ AMPLIFIER
VARIABLE BEAM S P L I T T E R A ^ AMPLIFIER
SHUTTER / j \ (V <•.
'
>V I ELECTRODE I J. Hf^ ^
\>' -y i DELAY LINE
OPTICS ^ - 4 j^—A ^ V?
\—& ~/y~~f-- I SHG
MULTIPASS CELL ' i
L BURNER J
x~\~-' J>. '-^ > T/' _ BOX CAR
SAMPLE -A A_ _ X ^
A M p L I F I E RJ _ _
f 1
COMPUTER
PRINTER ' MEMORY
LASER
.
N2.
x e c l f.
Nd.
Cu.
AP+.
U N l T YEmission
.
337.
308.
3 5 5 - 5 3 2 . 517.
515.
nmP u l s e Energy
.
4.
100.
70- 200.
5 .- .
mJP u l s e D u r a t i o n 6
.
20.
10 - 1 5.
30. - .
ns Peak Power.
0 , 6.
5.
7 - 1 4 . 0 , 1 6 . 5 . 1 6 ~.
MWRep. Rate 3
50
.
20 1 0 - 1 0 . 5 . 1 0 .- .
p . p . sAverage Power. 0 , 2
.
2.
0 , 7 - 2.
25.
5 . WDYE LASER
h
min..
360.
322.
3 8 0 - 5 5 0 . 550** .
420.
nmh
max..
1000.
1000. -
1000.
720.
1100.
nmh
2 ,217-
360.
217- 340.
200- 380*. 275- 360.
255- 345.
nm#
*
frequency mixing**
i m p o s s i b l e beetwen 360 and 550 nm.T a b l e I1
Radio frequency i n t e r f e r e n c i e s a r e t h e main background n o i s e wich l i m i t e d t h e s e n s i t i v i t y , t h u s SOPRA excimer and i t s power s u p p l y have been i s o l a t e d i n a double c o a x i a l Faraday cage.
The m u l t i p a s s c e l l i n c r e a s e d t h e s i g n a l by t h e number of round t r i p s . T t e l i n e a r dynamic range is h i g h e r t h a n 104.
The main c h a r a c t e r i s t i c s of t h e 2 dye l a s e r s a r e :
- t h e covered range 217 t o 700 nm, t h e band p a s s l e s s t h a n 0 , 0 5
a,
0 , 2 t o 5 mJ o f energy p e r p u l s e depending o f t h eh.
T h i s i n s t r u m e n t h a s been developped under DGRST c o n t r a c t . FURTHER IMPROVEMENTS :
l 0 - A b e t t e r a t o m i s a t i o n s o u r c e
2 O - E a s i e r change of wave-length range 3O - B e t t e r wave-length c a l i b r a t i o n
4O
-
More s t u d i e s on t h e second s t e p i n o r d e r t o improve s e n s i t i v i t y and s e l e c t i v i t y ( i n t e r f e r e n c e s )( 1 ) GREEN, R . G . ; KELLER R - A . ; LUTHER, G.G. ; SCHENCK, P. K. ; TRAVIS, J . C . Appl. Phys. L e t t . 1976, 29, 727 - 729.
(2) TURK, C.G. ; TRAVIS, J.C. ; De VOE, J.R. ; O'HAVER, T.C.
Anal. Chem. 1979, 51, 1890
-
1896( 3 ) BERTHOUD, T ; LIPINSKY, J ; CAMUS, P ; STEHLE, J.L.
Anal. Chtm. 1983, 55, 359 - 953