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.

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.

Absorption spectrum and absorption coefficients of NO2 in the vacuum ultraviolet region

1978 ◽  
Vol 56 (7) ◽  
pp. 962-973 ◽  
Author(s):  
Yumio Morioka ◽  
Harunobu Masuko ◽  
Masatoshi Nakamura ◽  
Michio Sasanuma ◽  
Eiji Ishiguro
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
Rydberg States ◽  
Ultraviolet Region ◽  
Photographic Method ◽  
Rydberg Series ◽  
Absorption Coefficients ◽  
Electron Synchrotron ◽  
Ionic State ◽  
Vacuum Ultraviolet Region

The absorption coefficients of NO2 in the region from 500 to 1100 Å are measured by a photographic method using the radiation from electron synchrotron as a background source. For the Rydberg series due to the transition from 4a1 to npπ, parameters q and Γ in Mies equation are obtained and the parameter q is determined to be −0.4 for every member and Γ 4.808/n*3 eV where n* is the effective quantum number.The absorption spectrum of NO2 in the region from 600 to 1600 Å are also analyzed. New vibrational progressions that are observed around 950 Å, are assigned to the excitations from 4b2 to ns Rydberg states (n = 3, 4, and 5) converging to the 1B2 ionic state. Assignments and discussions of many other Rydberg series that appear in the absorption spectrum between 600 and 1600 Å are also presented.

THE ABSORPTION SPECTRUM OF THE P2 MOLECULE IN THE VACUUM ULTRAVIOLET

1966 ◽  
Vol 44 (7) ◽  
pp. 1583-1592 ◽  
Author(s):  
F. Creutzberg
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Excited States ◽  
Vacuum Ultraviolet ◽  
Vibrational Constants

The absorption spectrum of P2 has been photographed at high resolution down to 1 220 Å. Eight band systems have been analyzed, including two that were first observed by Dressier. Four of the excited states are identified as [Formula: see text] states and four as 1Πu states. Rotational and vibrational constants are given for the excited states, including improved constants for the previously known lowest excited [Formula: see text] state.

Electronic spectrum of the BF molecule

1970 ◽  
Vol 48 (4) ◽  
pp. 432-452 ◽  
Author(s):  
R. B. Caton ◽  
A. E. Douglas
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Ionization Potential ◽  
Electronic Spectrum ◽  
Excited States ◽  
Electronic Absorption ◽  
Rydberg States ◽  
Electronic States ◽  
Rydberg Series ◽  
Absorption And Emission

The electronic absorption and emission spectrum of BF has been photographed at high resolution from 900 to 11 000 Å. In this work, many new electronic states have been found and corrections have been made to earlier work. The ionization potential has been determined to be between 89 635 and 89 680 cm−1, with the most probable value being 89 650 cm−1. Tables of the vibrational and rotational constants of all the known states of BF are presented. All but two of the excited states of BF have been classified as Rydberg states and have been assigned to Rydberg series. The interactions between the various Rydberg states are discussed.

THE ABSORPTION SPECTRUM OF SH AND SD IN THE VACUUM ULTRAVIOLET

1966 ◽  
Vol 44 (10) ◽  
pp. 2447-2459 ◽  
Author(s):  
B. A. Morrow
Keyword(s):  
Absorption Spectrum ◽  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Flash Photolysis ◽  
Electronic States ◽  
Rydberg Series ◽  
A Value ◽  
Vibrational Constants

The absorption spectrum of SH in the vacuum ultraviolet has been obtained by the flash photolysis of hydrogen sulfide. Transitions from the 2Π ground state to seven excited states have been observed and four of these fit reasonably well into a Rydberg series. From an extrapolation to the convergence limit of this series, a value of 10.40 ± 0.03 eV for the ionization potential of SH has been derived. Values for the rotational constants of these new electronic states have been determined; corresponding data for SD have also been obtained. The (1–0) transition of the system near 1 670 Å (B2Σ–X2Π) was observed, and, with the aid of isotope relations, vibrational constants of the B state have been derived. An estimate of the dissociation energy of SH in this excited state is D0′ = 24 190 ± 1 000 cm−1.

scholarly journals High Resolution Photoionization Spectrum of HBr Measured With Frequency Tripled Laser Radiation

1987 ◽  
Vol 7 (2-4) ◽  
pp. 129-139 ◽  
Author(s):  
Toshiaki Munakata ◽  
Tadahiko Mizukuki ◽  
Akira Misu ◽  
Motowo Tsukakoshi ◽  
Takahiro Kasuya
Keyword(s):  
Laser Radiation ◽  
High Resolution ◽  
Ultraviolet Radiation ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Second Harmonic ◽  
Rydberg Series ◽  
Vacuum Ultraviolet Radiation ◽  
Ionization Limit ◽  
Photoionization Spectrum

The photoionization spectrum of HBr around the first ionization limit was measured at resolution of up to 5 x 10−4 nm. The ionizing vacuum ultraviolet radiation was generated by frequency tripling of the second harmonic output of a dye laser. Three sets of Rydberg series, each converging to the ground state (2Π3/2) of HBr+, were observed on the longer wavelength side of the ionization limit. By extrapolation of the Rydberg series, the ionization potential of HBr was determined to be 11.666 ± 0.001 eV.

The absorption and emission spectra of HD in the vacuum ultraviolet

1976 ◽  
Vol 54 (5) ◽  
pp. 525-567 ◽  
Author(s):  
I. Dabrowski ◽  
G. Herzberg
Keyword(s):  
Absorption Spectrum ◽  
Ab Initio ◽  
Excited States ◽  
Vacuum Ultraviolet ◽  
Emission Spectra ◽  
Dissociation Limit ◽  
Infinite Mass ◽  
Ab Initio Theory ◽  
Vibrational Constants ◽  
Weak Transitions

The absorption spectrum of HD has been studied under high resolution in the vacuum ultraviolet to 840 Å, the emission spectrum to 1000 Å. The analysis of the latter gives accurate rotational constants and vibrational intervals of the ground state right up to the dissociation limit. Comparing these experimental data with calculations from ab initio theory, agreement to the same extent as was previously found for H2 and D2 is obtained. Extrapolation of the obs. – calc. values from H2 and D2 to infinite mass yields agreement with the recently revised theoretical values to within less than 0.1 for v < 7 and less than 0.5 cm−1 for the whole range of observed v values. The deviations for finite mass (H2 and D2) are clearly due to the non-adiabatic corrections neglected in the ab initio calculations. The results for HD are not halfway between H2 and D2 but are closer to H2. This apparent anomaly can be quantitatively accounted for, on the basis of recent calculations of Wolniewicz, by the effect of additional nonadiabatic corrections caused by the excited Σu states which in HD, unlike H2 and D2, can interact with the ground state.The rotational and vibrational constants of the excited states B1Σu+, C1Πu, and B′1Σu+ show somewhat larger deviations from ab initio values ranging for v0v from 5 to 120 cm−1, just as for H2 and D2. The electronic isotope shift of HD lies approximately half-way between the values of H2 and D2 as expected. In addition to the B–X, C–X, and B′–X systems the absorption spectrum of HD, unlike that of H2 and D2, shows an extensive progression of weak transitions to the double minimum state EF1Σg+ and a few very weak transitions to the G1Σg+ and I1Πg states. For the EF state both levels in the outer minimum (F) and levels above the maximum are observed. The correlation of the six excited states B, C, B′, EF, G, and I to the two close-lying dissociation limits corresponding to H + D* and H* + D is briefly discussed.

The absorption spectrum of Cl2 in the vacuum ultraviolet

1981 ◽  
Vol 59 (6) ◽  
pp. 835-840 ◽  
Author(s):  
A. E. Douglas
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
Band System ◽  
Rydberg States ◽  
Ultraviolet Region ◽  
Isotopic Molecule ◽  
Vacuum Ultraviolet Region ◽  
Vibrational Constants ◽  
Made In

The absorption spectrum of Cl2 in the vacuum ultraviolet region has been photographed with sufficient resolution to allow rotational analyses of many bands. The separated isotopic molecule 35Cl2 and cooled absorption cells were used to simplify the spectrum. A band system associated with an ionic state has been observed in the 1330–1450 Å range. Many large perturbations in the system prevent the determination of the usual rotational and vibrational constants. Some progress has been made in the analyses of a few bands associated with Rydberg states.

High resolution absorption spectrum of nitrogen in the vacuum ultraviolet

1977 ◽  
Vol 48 (2) ◽  
pp. 245-250 ◽  
Author(s):  
P. Gürtler ◽  
V. Saile ◽  
E.E. Koch
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Vacuum Ultraviolet
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