# Response to â€˜â€˜Comment on â€˜The exactness of the extended Koopmansâ€™ theorem: A numerical studyâ€™â€™ [J. Chem. Phys. 99, 6221 (1993)]

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We report results from the application of the relativistic complex optical potential (ROP) method to electronâ€“beryllium scattering. The energy range of this study was 0â€“5000 eV, with the results for the integral elastic cross sections, momentum transfer cross sections, summed...

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A unified theoretical approach is applied to calculate electron impact ionization cross sections for He-like ions(Be[sup 2+], B[sup 3+], and C[sup 4+]). The 25 target states including 10 pseudostates are used in the R-matrix calculation. The cross sections are obtained as the sum of the cross...

- The exactness of the extended Koopmansâ€™ theorem: A numerical study. Sundholm, Dage; Olsen, Jeppe // Journal of Chemical Physics;3/1/1993, Vol. 98 Issue 5, p3999
The exactness of the extended Koopmansâ€™ theorem has been studied by comparing multiconfiguration Hartreeâ€“Fock calculations on Be(1S) with configuration interaction calculations on Be+(2S) performed in the same basis. The lowest ionization potentials calculated as the energy...

- Comment on â€˜â€˜The exactness of the extended Koopmansâ€™ theorem: A numerical studyâ€™â€™ [J. Chem. Phys. 98, 3999 (1993)]. Morrison, Robert C. // Journal of Chemical Physics;10/15/1993, Vol. 99 Issue 8, p6221
Recent systematic, numerical calculations by Sundholm and Olsen [J. Chem. Phys. 98, 3999 (1993)] support the proof that the lowest ionization potential can in principle be obtained exactly using the extended Koopmansâ€™ theorem. Because of the nature of their calculations it cannot be...

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A Be-related donor level was identified in the band gap of GaN. Thermal admittance spectroscopy (TAS) was combined with the radiotracer principle by applying the radioactive isotope 7Be which was implanted into n-type and p-type GaN. TAS spectra of n-type GaN recorded, repeatedly, during the...

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The terms of ions and atoms are calculated with a method based on the Bohr model. The ionization potentials of helium-like, lithium-like, and beryllium-like ions are calculated as functions of the nuclear charge and electron quantum numbers. The results calculated are in satisfactory agreement...

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A simple user-friendly empirical formula is proposed to calculate the electron impact total single ionization cross sections of beryllium-like Be, B+, C2+, N3+, O4+, Ne6+, Fe22+, Hg76+, and U88+ and boron-like B, C+, N2+, O3+, Ne5+, Fe21+, Kr31+, and Xe49+ targets. A simplified and modified...

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We describe laser systems for photoionization, Doppler cooling, and quantum state manipulation of beryllium ions. For photoionization of neutral beryllium, we have developed a continuous-wave 235 nm source obtained by two stages of frequency doubling from a diode laser at 940 nm. The system...

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The ground electronic state of BeOBe+ was probed using the pulsed-field ionization zero electron kinetic energy photoelectron technique. Spectra were rotationally resolved and transitions to the zero-point level, the symmetric stretch fundamental and first two bending vibrational levels were...