Excitation of Rydberg states of HgCl/sub 2/ and HgBr/sub 2/ by electron impact

Journal Article · Fri Feb 15 04:00:00 EST 1985 · J. Chem. Phys.; (United States)

OSTI ID:5968660

Spence, D; Wang, R; Dillon, M A

We have examined the electronic structure of HgCl/sub 2/ and HgBr/sub 2/ from 5 to 14 eV by high resolution electron energy loss spectroscopy. Our measurements include the near-UV region which has not been examined by any previous technique and which is found to be rich in Rydberg states. In particular, in each molecule we identify members of two optically allowed Rydberg series and one forbidden series with electronic structues sigma/sup 2//sub g/sigma/sup 2//sub u/..pi../sup 4//sub u/..pi../sup 3//sub g/ (np..pi../sub u/, npsigma/sub u/, and nd..pi../sub g/, or (n+1)ssigma/sub g/) which converge to the /sup 2/product/sub g/ ground ionic state. In addition, other structures which form the dominant energy loss mechanisms in our spectra are identified as arising from optically allowed Rydberg states associated with the excited ionic states /sup 2/Pi/sub u/, /sup 2/..sigma../sub u/, and /sup 2/..sigma../sub g/. Measurements at energy loss below 9 eV confirm previous valence states observed in photoabsorbtion and suggest the existence of two new valence states in each molecule. Angular measurements facilitate identification of many of the newly observed structures in our electron-energy loss spectra.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5968660
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 82:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COLLISIONS
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELECTRON-MOLECULE COLLISIONS
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY LOSSES
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
HALIDES
HALOGEN COMPOUNDS
LOSSES
MERCURY BROMIDES
MERCURY CHLORIDES
MERCURY COMPOUNDS
MERCURY HALIDES
MOLECULE COLLISIONS
RYDBERG STATES
SPECTROSCOPY