Rydberg series and ionization potential of the H2 molecule

The excited and ionized states of the heavier rare‐gas molecules are discussed, existing evidence on the dissociation energies of the ions are reviewed, and estimates of these dissociation energies are made. Estimated potential curves for the Xe2+ ion and for the lower excited states of the Xe2 molecule are given. Applications to the interpretation of the observed spectra of the heavier rare gases, especially Xe2, are discussed.

Potential Curves of Diatomic Rare‐Gas Molecules and Their Ions, with Particular Reference to Xe2

The ionization energy of nitric oxide

The observed quantum defects in the s and d Rydberg series of NO are interpreted. It has been shown previously that the nf Rydberg states of NO conform to a long‐range force model. This model assumes that the motion of the Rydberg electron is determined only by the long‐range potential of the NO+ core. The same model, when applied to the nd states, fails to reproduce the observations. The differences between predicted and observed energies result from: (i) exchange effects and increased nuclear attraction inside the core, (ii) the required orthogonality of the wavefunction of the Rydberg electron with respect to core electrons, (iii) mixing of the dσ with the sσ Rydberg series. In order to describe these effects (called penetration effects) quantitatively, the long‐range force model is supplemented by additional parameters. These parameters are determined independently from the observed electronic and from the observed rotational energy level patterns, and good agreement is found. The mixing of the dσ wit...

Rydberg Series in the NO Spectrum: An Interpretation of Quantum Defects and Intensities in the s and d Series

The s and d Rydberg states of NO with v = 0 have been observed for 6 leqslant; n* leqslant; 40 by double resonance multiphoton ionization which was three-photon resonant with the 3pπC 2∏ (v = 0) Rydberg intermediate state. Strong parity selection is shown to occur in the intermediate level despite the fact that the Λ-doublets are not resolved. The OODR spectra are thereby considerably simplified. A unified description of the rotational-electronic structure of the s and d Rydberg states in terms of quantum defect theory is presented, extending from the low n* s, d supercomplexes up beyond the ionization threshold. Electronic radial dipole transition moments are calculated and included in the MQDT analysis, giving evidence for a Cooper minimum in the region of the supercomplex n* = 5. For 25 leqslant; n* leqslant; 40 fringes are observed in the OODR spectrum and are interpreted in terms of rotational l-uncoupling, electronic s ∼d mixing and energy dependent electronic dipole transition moments. The fringe f...

s and d Rydberg series of NO probed by double resonance multiphoton ionization

The 0–0 bands at 1474 A and 1422 A of the first two members of the nf–X2Π Rydberg series of NO have been observed under high resolution in the absorption spectrum of cold nitric oxide gas. They sho...

Absorption spectrum of the NO molecule. IX. The structure of the f complexes, the ionization potential of NO, and the quadrupole moment of NO+

Heterogeneous perturbations 2E+ ~ 2Π of largely different magnitudes are observed with high resolution in the vacuum-ultraviolet absorption and in the infrared emission spectrum of the NO molecule....

Absorption spectrum of the NO molecule. VIII. The heterogeneous (2Σ–2Π) interactions between excited states

Two‐photon spectroscopy of supersonically cooled NO in the region between the NO+ X 1Σ+, v+=0 and 1 ionization thresholds reveals the n=7–12 members of the ndπ−, v=1 Rydberg series. The n=5 member of the same series is observed below the two‐photon ionization threshold by using two‐photon resonant, three‐photon ionization. The data are analyzed by using multichannel quantum defect theory to extract rotationless quantum defects and to reveal perturbation by the nf, v=1 series. Theoretical two‐photon rotational line strengths are in satisfactory agreement with the observed data.

Two‐photon spectroscopy of Rydberg states of NO

The Emission Spectrum of the no Molecule in the Vacuum Ultraviolet, 1600-1400 Å.

The 4 mu m band radiation from high temperature air investigated by Wray and Taylor in 1969 is interpreted as 5g-4f emission of the NO molecule. Position, fine-structure and intensity of the band are in excellent agreement with previous knowledge on the 4f complex of NO and with theoretical 5g energies and 5g-4f oscillator strengths.

E. Miescher

Papers

Absorption spectrum of the NO molecule. IX. The structure of the f complexes, the ionization potential of NO, and the quadrupole moment of NO+

Absorption spectrum of the NO molecule. VIII. The heterogeneous (2Σ–2Π) interactions between excited states

Two‐photon spectroscopy of Rydberg states of NO

The Emission Spectrum of the no Molecule in the Vacuum Ultraviolet, 1600-1400 Å.

Identification of the 5g-4f Rydberg-Rydberg transition of the NO molecule