### Session E6: Photon Interactions With Atoms, Ions and Molecules - Experiment

1:30 PM–2:54 PM, Wednesday, May 17, 2006
Knoxville Convention Center Room: 301C

Chair: Timothy Gay, University of Nebraska

Abstract ID: BAPS.2006.DAMOP.E6.2

### Abstract: E6.00002 : H$\alpha$, H$\beta$, and Ly$\alpha$ fluorescence from the photodissociation of H$_{2 }$and D$_{2}$

1:42 PM–1:54 PM

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#### Authors:

T.J. Gay
J.R. Machacek

J.E. Furst
(University of Newcastle-Ourimbah)

A.L.D. Kilcoyne
J.D. Bozek
(ALS/LBNL)

H. Gould
(LBNL)

M.S. Lubell
(CC-CUNY)

K.W. McLaughlin
(Loras College)

We have measured the intensity, corrected for polarization, of H$\alpha$ (656 nm), H$\beta$ (486 nm), and Ly$\alpha$ (122 nm) fluorescence from the photodissociation of H$_{2}$ and D$_{2 }$by linearly-polarized photons with energies between 25 and 150 eV. We observe a low-energy maximum in the intensities for all three transitions between 35 and 40 eV, due to excitation of doubly-excited molecular states. A second shoulder or secondary maximum is attributed to the direct production of excited $H_2^+$ states which subsequently dissociate into the excited atoms. This second maximum is in qualitative agreement with the H$\alpha$ results of Garcia \textit{et al.} [1]. The effects of cascading and the size of the visible collision volume on these data is discussed. [1] Garcia \textit{et al.}, J. Phys. B \textbf{39, }205 (2006).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.DAMOP.E6.2