Analysis of the 8ƒ, 9ƒ, and 10ƒ, v=1 Rydberg states of N₂

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.44.3007· OSTI ID:5221223

McCormack, E. F. ^[1]; Pratt, Stephen T. ^[1]; Dehmer, Joseph L. ^[1]; Dehmer, Patricia M. ^[1]

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1. Argonne National Laboratory (ANL), Argonne, IL (United States)

The autoionizing (X ²Σ_g⁺) 8ƒ, 9ƒ, and 10ƒ, v=1 states of N₂ have been studied by using double-resonance ionization spectroscopy via numerous rotational levels of the a ¹Π_g, v´=5 state. These nƒ states lie in a complex region of the spectrum that also contains transitions to high vibrational levels of the b´ ¹Σ_u⁺ valence state and Rydberg states that converge to the X ²Σ_g⁺, A ²Π_u, and B ²Σ_u⁺ states of the ion. A long-range interaction model, which is based on the interaction of the Rydberg electron with the polarizability and quadrupole moment of the N₂⁺ ion core, has been used to interpret the ƒ-state structure and to identify the extent of perturbations due to interactions with nearby states. A generalized least-squares fit of the model to the energies of the unperturbed 8ƒ state yields an effective quadrupole moment of (3.2±0.1)ea₀² and an isotropic polarizability of (16.1±0.4)a₀³ for the X ²Σ_g⁺, v⁺=1 state of the ion. In addition, a new state that is observed to perturb the 9ƒ, v=1 state is tentatively identified as the previously unobserved (A ²Π_u)3dπ ¹Δ_u, v=2 state. The results presented here complete the interpretation of the single-photon absorption spectrum of N₂ from the first ionization potential at ~ 125 667 to ~ 126 850 cm^-1.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Research, Office of Health and Environmental Research; USDOE Office of Health and Environmental Research. Alexander Hollaender Program
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5221223
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 44; ISSN 1050-2947; ISSN PLRAAN
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
AUTOIONIZATION
CHARGED PARTICLES
DATA
DOUBLE RESONANCE METHODS
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
INFORMATION
IONIZATION
IONS
LEAST SQUARE FIT
MAXIMUM-LIKELIHOOD FIT
MOLECULAR IONS
NITROGEN
NONMETALS
NUMERICAL DATA
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
POLARIZABILITY
QUADRUPOLE MOMENTS
RYDBERG STATES
SPECTRA
SPECTROSCOPY