Precision Measurement of the Ionization and Dissociation Energies of H_2, HD and D_2

Details Precision Measurement of the Ionization and Dissociation Energies of H_2, HD and D_2 Precision Measurement of the Ionization and Dissociation Energies of H_2, HD and D_2

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..conferd08s&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

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Mini-Symposium: Precision/Frequency Combs

Scientific paper

The ionization and dissociation energies of H_2, HD and D_2 are benchmark quantities in molecular quantum mechanics. Comparison between experimental and theoretical values for these quantities has a long history starting with the early measurement of Beutler and the calculations of James and Coolidge. Transition wave numbers from the EF ^1Σ g^+ (v=0,N=0,1) state to selected np Rydberg states (n ≈ 60) below the X+ ^2Σ^+u (v^+=0,N^+=0,1)} ionization threshold have been measured in H_2, HD and D_2 at a precision better than 10 MHz (0.0003 cm-1). Combining the results with previous experimental and theoretical data for other energy level intervals, the ionization and dissociation energies of H_2, HD and D_2 could be determined at an absolute accuracy of better than 20 MHz. These new results represent an improvement over previous experimental results by more than one order of magnitude and the most precise values of dissociation and ionization energies measured to date in a molecular system. The results therefore offer the opportunity of a comparison with theoretical values. In particular they will be compared to the latest ab initio calculations which include nonadiabatic, relativistic and radiative effects. The comparison indicates that relativistic and radiative quantum electrodynamics corrections of order up to α^4 are needed to account for the experimental results.
H. Beutler, Z. Phys. Chem. 29, 315 (1935)
H. M. James and A. S. Coolidge, J. Chem. Phys. 1, 825 (1933)
J. Liu, E. J. Salumbides, U. Hollenstein, J. C. J. Koelemeij, K. S. E. Eikema, W. Ubachs, and F. Merkt, J. Chem. Phys. 130, 174306 (2009)
J. Liu, D. Sprecher, Ch. Jungen, W. Ubachs, and F. Merkt, submitted to J. Chem. Phys.
K. Piszczatowski, G. Łach, M. Przybytek, J. Komasa, K. Pachucki, and B. Jeziorski, J. Chem. Theory Comput. 5, 3039 (2009)

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