The Band Spectrum of Aluminium Bromide

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The Band Spectrum of A l d u m Bromide

(Plate X.)

(Rcceirtd jar publication, March

26,

I93

j.)

The lip~ctrum of AlBr ban been photogrnpbed with rnderatelj dispemion. The vibrational anelyais of the b a d e ia in ugmment with that given by Crawford and Ffolliott. Approximate values of the Pibr&ioad muat ant8 have been calou!ated from t.he

Q

head dab. The identity of tb emitter i s canfirmed by the clme agreement between the cslcuIated gzld obeetved isotopic displocemants. Pradismiation hrrs ben found to be oper- ating st the upper state above r l = 3 and i s ~ t t r i b u t d to khe interectian of e Heitler-London lerel w h m p d u c t a of dissociation are pmbably a narmd aluminium atom (SSP

a

) md an excited bmmine atom (bSD

~t

)-

1.

Introduction.

No band spectrum associated with t k molecule of alumi- nium bromide was

recorded

by the early investigators. But

in

the discharge through the \%pour of aluminium tri-bromide, AIBra, Craw ford

and

F folliott

^l

r e p r k d the eri~tence of

a system

of red-degrading bands

in

the region k?1745-h8W5. They ascribed them ta the diatomic molecule, AlBr, and gave an

q u a -

tion of their R _heads rneasuted from low dispersion spectmpme.

More recently them bands have also bmn obeervd bg hdiescber?

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