RYDBERG ABSORPTION SERIES OF CO2 CONVERGING TO THE 2Πu STATE OF

1962 ◽  
Vol 40 (7) ◽  
pp. 879-886 ◽  
Author(s):  
Y. Tanaka ◽  
M. Ogawa
Keyword(s):  
Absorption Spectrum ◽  
Ionization Energy ◽  
Grazing Incidence ◽  
Ionization Potentials ◽  
Rydberg Series

The absorption spectrum of CO2 has been reinvestigated in the region 670–790 Å with a 6.8-meter grazing-incidence-type vacuum spectrograph. The Henning Rydberg series has been remeasured accurately along with its ν′ = 1 vibration series. In this manner, the ionization energy of the 2σu electron was determined to be 18.076 ev. Sixteen other Rydberg series were observed in this region. It was concluded that they are formed by the excitation of the 1πu electron. The ionization potentials corresponding to the energies of the 2Πu,3/2 and 2Πu,1/2 states of [Formula: see text] were found to be 17.312 ev and 17.323 ev respectively.

High resolution absorption spectrum of nitric oxide (NO) in the region of the first ionization limit

1976 ◽  
Vol 54 (20) ◽  
pp. 2074-2092 ◽  
Author(s):  
E. Miescher
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Ionization Energy ◽  
Dissociation Limit ◽  
Matrix Elements ◽  
Rydberg Series ◽  
Isotopic Species ◽  
Vibrational Levels ◽  
Energy Formula ◽  
Ionization Limit

The absorption spectrum of cold NO gas has been photographed at high resolution between 1400 and 1250 Å for two isotopic species. Resolved bands of the Rydberg series converging to vibrational levels of the 1Σ+ ground state of NO+ are studied. They include nf–X bands up to n = 15 and ns–X bands up to n = 11, all of which show sharp rotational structure. The higher members of the np–X series are generally very diffuse with only npσ being sufficiently sharp to show broadened rotational lines. Also mostly diffuse are the ndδ–X bands. The bands ndσ, π–X are not observed. The rapidly (n−3) narrowing structure of the nf complexes is discussed and the ionization energy [Formula: see text] accurately determined by extrapolation of selected rotational lines. Interactions between Rydberg states are numerous, s ~ d mixing produces a strong effect above n = 6 when (n + 1)s levels fuse with nl levels into 'supercomplexes'. Matrix elements are given for observed 8f ~ 9s and 6f ~ 6dδ interactions.Valence levels are not observed above the ionization energy, except for the repulsive state A′2Σ+ arising from the first dissociation limit and seemingly assuming Rydberg character at molecular internuclear distance. Observed anomalies are qualitatively discussed.

scholarly journals RYDBERG ABSORPTION SERIES OF N2

1962 ◽  
Vol 40 (11) ◽  
pp. 1593-1607 ◽  
Author(s):  
M. Ogawa ◽  
Y. Tanaka
Keyword(s):  
Absorption Spectrum ◽  
Electronic States ◽  
Grazing Incidence ◽  
The Other ◽  
Electronic Transitions ◽  
Electron Configuration ◽  
Rydberg Series ◽  
M 31

The absorption spectrum of N2 in the 600–1000 Å region, particularly the Rydberg series, has been reinvestigated with a grazing incidence spectrograph with a 6.8-meter concave grating.Worley–Jenkins' Rydberg series which converges to the [Formula: see text] state of [Formula: see text] was extended to m = 31. It is suggested that the doublet character of this series is due to the two electronic transitions whose upper states are 1Πu and [Formula: see text] given by the electron configurations:[Formula: see text]and[Formula: see text]respectively.Eight Rydberg series, including Worley's third series, were observed in the region between 710 and 950 Å. These series are divided into two groups, each consisting of four vibration series, ν′ = 0, 1, 2, and 3, with one converging to the A2Πu, 1/2 state and the other to the A2Πu, 3/2 state of [Formula: see text]. The upper electronic states of these two groups are assigned as 1Πu and 3Πu states given by the electron configuration:[Formula: see text]Hopfield's Rydberg series which converges to the [Formula: see text] state of [Formula: see text] was extended to m = 21, and in addition, one vibration series (ν′ = 1) was newly observed. The upper electronic states of the series are assigned as [Formula: see text] states, given by the configuration:[Formula: see text]Another absorption series, which is accompanied closely by the Hopfield emission series, was also observed and the upper electronic states of the series are assigned as [Formula: see text] states, given by the configuration:[Formula: see text]

On the validity of the spectator electrons model in the 3d and 4s excitation spectra of Mn I

1979 ◽  
Vol 367 (1730) ◽  
pp. 381-394 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Rydberg Series ◽  
Excitation Spectra ◽  
Hartree Fock ◽  
The Spectator

New observations of the absorption spectrum of Mn I between 1800 and 700 Å have revealed 77 new transitions, arrangeable in Rydberg series converging on to experimentally known levels of the ion. The analysis of the spectrum at wavelengths shorter than 1300 Å suggests assignments for several previously unidentified transitions in the 1300-1600 Å range. Comparisons with ah initio Hartree-Fock calculations are attempted, and the spectator electrons model is shown to provide the correct framework for the analysis of 3d and 4s excitation in Mn I.

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

1968 ◽  
Vol 46 (8) ◽  
pp. 987-1003 ◽  
Author(s):  
Ch. Jungen ◽  
E. Miescher
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Excited States ◽  
Rydberg State ◽  
Vacuum Ultraviolet ◽  
Principal Quantum Number ◽  
Rydberg States ◽  
Infrared Emission ◽  
Strong Interactions ◽  
Rydberg Series

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. The rotational interactions between 2Σ+ Rydberg states and levels of the B2Π non-Rydberg state are shown to be "configurationally forbidden", but produced by the configuration interaction between the non-Rydberg levels and 2Π Rydberg states. The latter together with the 2Σ+ Rydberg states form p complexes. In this way the interactions display the l uncoupling in the complexes; they can be evaluated theoretically and can be analyzed fully. The cases of the strong interactions D2Σ+(v = 3) ~ B2Π(v = 16)and D2Σ+(v = 5) ~ B2Π(v = 21) and of the weaker D2Σ+(v = 1) ~ B2Π(v = 11), all three observed as perturbations in ε bands crossing 3 bands, are discussed in detail. It is further shown that perturbations between γ bands and β bands as well as perturbations between analogous bands of higher principal quantum number are absent, and thus the assignment of the A2Σ+ and E2Σ+ states to the s Rydberg series is confirmed.

The electronic spectrum of F2

1976 ◽  
Vol 54 (13) ◽  
pp. 1343-1359 ◽  
Author(s):  
E. A. Colbourn ◽  
M. Dagenais ◽  
A. E. Douglas ◽  
J. W. Raymonda
Keyword(s):  
Absorption Spectrum ◽  
Ground State ◽  
Band System ◽  
Rydberg States ◽  
Rotational Analysis ◽  
Interaction Energies ◽  
Rydberg Series ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Ionic States

The absorption spectrum of F2 in the 780–1020 Å range has been photographed at sufficient resolution to allow a rotational analysis of many bands. A large number of vibrational levels of three ionic states have been observed and their rotational constants determined. Many perturbations in the rotational structure caused by the interaction between the three states have been investigated and the interaction energies determined. The rotational and vibrational structures of a few Rydberg states have also been analyzed in detail but no Rydberg series have been identified. The difficulties in assigning the observed states are discussed. A 1Σu+ – X1Σg+ emission band system has been observed in the 1100 Å region. An analysis of the bands of this system has allowed us to determine the term values and rotational constants of all the vibrational levels of the ground state with ν ≤ 22. The dissociation energy, D0(F2), is found to be greater than 12 830 and is estimated to be 12 920 ± 50 cm−1.

ON THE ABSORPTION SPECTRUM OF H2O AND D2O IN THE VACUUM ULTRAVIOLET

1963 ◽  
Vol 41 (2) ◽  
pp. 209-219 ◽  
Author(s):  
J. W. C. Johns
Keyword(s):  
Absorption Spectrum ◽  
Water Vapor ◽  
High Resolution ◽  
Heavy Water ◽  
Vacuum Ultraviolet ◽  
Rydberg Series ◽  
Accuracy Of Measurement ◽  
Concave Grating

The spectra of normal and heavy water vapor have been observed under high resolution in the region 1220–1240 Å. One band of H2O and two bands of D2O have been measured and analyzed. The spectra were taken in the ninth order of a 35-ft concave-grating spectrograph and the accuracy of measurement of the sharper lines is estimated to be about ± 0.005 Å. The results of the analyses are summarized below.[Formula: see text]These bands have been assigned as belonging to the first member of one of the two np Rydberg series.

Rydberg series and autoionization resonances in the Y I absorption spectrum

1973 ◽  
Vol 333 (1592) ◽  
pp. 17-24 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Ionization Potential ◽  
Excited States ◽  
Spectral Range ◽  
Ground State ◽  
Rydberg Series ◽  
A Value ◽  
Doublet Ground State ◽  
Ionization Limit ◽  
First Ionization Potential

The absorption spectrum of yttrium vapour has been photographed in the spectral range 1650 to 2250 À, with a 10 m spectrograph. Series of autoionization resonances, which converge on excited states of the Y + ion have been identified, as combinations with the doublet ground-state of Y I , 5s 2 4d 2 D 3/2 , 5/2 . Although the lines of these series show broadened and often asymmetrical profiles, the lines are sufficiently well defined to fix a value for the first ionization potential of Y I , which differs from the previously accepted value by approximately 2500 cm -1 . In addition, approximately 400 new Y I lines, which involve excited levels below the first ionization limit of Y I , namely 4s 2 1 S o , have been found. The majority of these are unclassifiable at present but, the value for the first ionization-potential being known from the resonances above-mentioned, two series of the character 5s 2 4d 2 D 3/2 , 5/2 -5s 2 nf 2 F o have been identified. In addition to the identifications of series, 152 new lines below the 5s 2 1 S o limit identify 76 new levels of Y I , of odd parity.

The absorption spectrum of Ag I in the vacuum ultraviolet

1978 ◽  
Vol 361 (1706) ◽  
pp. 379-398 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Synchrotron Radiation ◽  
Variational Method ◽  
Theoretical Prediction ◽  
Ab Initio ◽  
Absorption Spectra ◽  
Vacuum Ultraviolet ◽  
Rydberg Series ◽  
Hartree Fock ◽  
Doubly Excited

The absorption spectrum of Ag I between 550 Å and 1590 Å has been investigated by using synchrotron radiation as the source of continuum. Over 50 new transitions are reported, nearly all of which can be classified into Rydberg series due to excitation of one electron from the 4d subshell. Identifications are made by comparison with previous studies of the arc spectrum as well as with absorption spectra of related elements. Ab initio Hartree-Fock calculations have revealed the importance of treating 5s 5p 1 P based levels by a separate variational method. Doubly excited configurations are also found, but, in contrast to a previous theoretical prediction, double vacancy production within the 4d subshell is not found to be significant for Ag I.

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