Rotational analysis of the forbidden d3 Δi ← X1Σ+ absorption bands of carbon monoxide

1970 ◽  
Vol 48 (24) ◽  
pp. 3004-3015 ◽  
Author(s):  
G. Herzberg ◽  
T. J. Hugo ◽  
S. G. Tilford ◽  
J. D. Simmons
Keyword(s):  
Carbon Monoxide ◽  
High Resolution ◽  
Intensity Distribution ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Rotational Analysis ◽  
Absorption Bands ◽  
Local Perturbations ◽  
Vacuum Ultraviolet Region ◽  
Π State

The forbidden d3Δi–X1Σ+ transition of CO has been observed in absorption at high resolution in the vacuum ultraviolet region. The intensity distribution in the rotational structure of the observed bands is in conformity with the assumption that the transition occurs on account of the interaction between the d3Δ state and a 1Π state, presumably the A1Π state. Thirteen bands of the d–X system have been analyzed yielding more extensive rotational data for the d3Δi state than were previously known. A discussion of the local perturbations in the d state by the A1Π and a3Π states is included.

THE FORBIDDEN I1Σ−–X1Σ+ ABSORPTION BANDS OF CARBON MONOXIDE

1966 ◽  
Vol 44 (12) ◽  
pp. 3039-3045 ◽  
Author(s):  
G. Herzberg ◽  
J. D. Simmons ◽  
A. M. Bass ◽  
S. G. Tilford
Keyword(s):  
Carbon Monoxide ◽  
Selection Rule ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Absorption Bands ◽  
Coriolis Interaction ◽  
Dipole Radiation ◽  
Vacuum Ultraviolet Region ◽  
Vibrational Constants ◽  
Π State

The forbidden I1Σ−–X1Σ+ transition of CO has been observed in absorption at high resolution in the vacuum ultraviolet region. As expected for a 1Σ−–1Σ+ transition, the bands consist of single Q branches, in which the lines of lowest J are either missing or very weak. Although the selection rule prohibiting Σ−–Σ+ transitions is rigorous for dipole radiation at zero rotation, the I1Σ−–X1Σ+ transition can occur for higher rotational levels because of Coriolis interaction with the A1Π state, which lies very close to the I1Σ− state.Eight bands of the I–X system have been analyzed and from them the rotational and vibrational constants of the I1Σ− state have been determined. Previous information on this state was based entirely on the study of perturbations in the A1Π state. The corresponding perturbations in the I1Σ− state have now been observed. In addition, small "vibrational" perturbations in the ν = 4 and 5 levels (probably caused by interactions with the a3Π state) are found.

The absorption spectrum of trans-diimide (N2H2) in the vacuum ultraviolet region

1981 ◽  
Vol 59 (3) ◽  
pp. 506-517 ◽  
Author(s):  
P. S. Neudorfl ◽  
R. A. Back ◽  
A. E. Douglas
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Singlet State ◽  
Ultraviolet Region ◽  
Ultraviolet Absorption Spectrum ◽  
Rotational Analysis ◽  
Trans Conformation ◽  
Vacuum Ultraviolet Region ◽  
Rydberg Transitions

The vacuum ultraviolet absorption spectrum of trans-diimide (N2H2) in the gas phase has been re-examined between 1800 and 1300 Å, using diimide prepared by the thermal decomposition of sodium tosylhydrazide. Two band systems were observed, designated [Formula: see text] and [Formula: see text], with origins at 1727 and 1473 Å, which have been assigned to the Rydberg transitions 3pπ(bu) ← n+ and 4pπ(bu) ← n+ respectively. Both systems show long progressions in v2′, the N—N—H symmetric bending frequency, and short progressions in v3′, the symmetric N—N stretching frequency.The [Formula: see text] system has well-resolved rotational J type structure in some bands, and the rotational analysis showed that the ground state is a totally symmetric singlet state of C2h symmetry (planar trans-N2H2 isomer), and that the system arises from a 1Bu ← 1Ag transition. Rotational constants obtained for the 0–0 band of the [Formula: see text]-state were A = 15.63, B = 1.32, and C = 1.22 cm−1, and the values of rH−N = 1.028 Å, rH−N = 1.167 Å, and [Formula: see text] were estimated from them assuming a planar trans conformation.

ISOTOPE SHIFT OF THE NITROGEN ABSORPTION BANDS IN THE VACUUM ULTRAVIOLET REGION

1964 ◽  
Vol 42 (9) ◽  
pp. 1716-1729 ◽  
Author(s):  
M. Ogawa ◽  
Y. Tanaka ◽  
A. S. Jursa
Keyword(s):  
Isotope Shift ◽  
Vacuum Ultraviolet ◽  
Electronic States ◽  
Normal Incidence ◽  
Ultraviolet Region ◽  
Nitrogen Absorption ◽  
Absorption Bands ◽  
Quantum Numbers ◽  
Vibrational Levels ◽  
Vacuum Ultraviolet Region

The vibrational isotope shift of the nitrogen absorption bands has been studied in the 830–1000 Å region. A 3-meter normal-incidence vacuum spectrograph was used with the helium continuum as background.According to our analysis, the vibrational quantum numbers assigned to the lowest observed vibrational levels for the various electronic states of N214 are as follows: [Formula: see text], 100 824 cm−1, ν = 0; (b 1Πu), 101 455 cm−1, ν = 1; (l 1Πu), 104 146 cm−1, ν = 5; [Formula: see text], 104 366 cm−1, ν = 0; (m 1Πu), 105 350 cm−1, ν = 5 ~ 7; (o 1Πu), 105 703 cm−1, ν = 0; [Formula: see text], 106 649 cm−1, ν = 4; (p 1Πu), 108 373 cm−1, ν = 9 ~ 10; [Formula: see text], 109 833 cm−1, ν = 11 ~ 12; [Formula: see text] 110 944 cm−1, ν = 10; (s ?), 116 688 cm−1, ν > 20; and (t ?), 118 486 cm−1,[Formula: see text]. The observed isotope shift for the bands [Formula: see text], 106 381 cm−1; [Formula: see text], 108 549 cm−1; (f ?), 110 196 cm−1; [Formula: see text] 110 664 cm−1; [Formula: see text], 112 777 cm−1; (h′ ?), 114 841 cm−1; (h″ ?), 116 820 cm−1; and [Formula: see text], 118 778 cm−1 increases in this order and shows that none of these bands corresponds to a (0, 0) band.

THE FAR ULTRAVIOLET (C–X) BANDS OF N2+

1956 ◽  
Vol 34 (3) ◽  
pp. 250-255 ◽  
Author(s):  
P. G. Wilkinson
Keyword(s):  
High Resolution ◽  
Intensity Distribution ◽  
Vacuum Ultraviolet ◽  
Rotational Analysis ◽  
Substantial Agreement ◽  
Rotational Constants ◽  
Ultraviolet C ◽  
Far Ultraviolet

Emission bands of the N2+ C–X system in the vacuum ultraviolet have been obtained under high resolution. The rotational analysis confirms the assignment as a [Formula: see text] transition and the rotational constants obtained are in substantial agreement with previous investigations. The unusual intensity distribution in the ν′ = 3 progression and perturbations in the ν′ = 0, 1, and 2 levels of the C state are in agreement with the theory of inverse predissociation in the ν′ = 3 level.

Luminescence Properties of Nd 3+ ‐Doped AlF 3 ‐Based Fluoride Glass in the Vacuum Ultraviolet Region

2020 ◽  
Vol 257 (8) ◽  
pp. 1900475
Author(s):  
Kohei Yamanoi ◽  
Yuki Minami ◽  
Toshihiko Shimizu ◽  
Nobuhiko Sarukura ◽  
Takahiro Murata ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Fluoride Glass ◽  
Luminescence Properties ◽  
Ultraviolet Region ◽  
Vacuum Ultraviolet Region
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