THE EMISSION SPECTRUM OF THE PH+ MOLECULE

1957 ◽  
Vol 35 (8) ◽  
pp. 901-911 ◽  
Author(s):  
N. A. Narasimham
Keyword(s):  
Emission Spectrum ◽  
Dissociation Energy ◽  
Hollow Cathode ◽  
Hollow Cathode Discharge ◽  
Spin Splitting ◽  
Rotational Constants ◽  
Π State ◽  
Large Spin

A system of three red degraded bands at 3854, 4228, and 3567 Å has been obtained in emission from a hollow cathode discharge through helium containing a little phosphorus vapor and hydrogen. Rotational analyses of the bands show that they are the 0–0, 0–1, and 1–0 bands of a 2Δ—2Π transition of the PH+ molecule. The 2Δ state is regular with small spin splitting (case b) while the 2Π state is regular with large spin splitting (case a). For ν = 0, the F1 levels of the 2Δ state with [Formula: see text] and the F2 levels with [Formula: see text] are predissociated. Also the lines arising from the F1 levels of the 2Δ state with ν = 1 are found to be extremely weak compared to those arising from the F2 levels. Vibrational and rotational constants have been determined and the dissociation energy has been found to be 3.06 ± 0.25 ev.

THE SPECTRUM OF CN IN THE VACUUM ULTRAVIOLET

1956 ◽  
Vol 34 (1) ◽  
pp. 83-95 ◽  
Author(s):  
P. K. Carroll
Keyword(s):  
Dissociation Energy ◽  
Fourth Order ◽  
Hollow Cathode ◽  
Vacuum Ultraviolet ◽  
Hollow Cathode Discharge ◽  
Molecular Constants

The spectrum of the CN radical has been investigated in the Schumann region using a three-meter vacuum spectrograph in the fourth order. A hollow cathode discharge through streaming helium, to which a trace of cyanogen was added, was used as source. Three new systems of bands were found in the region 1650–2100 Å. These involve two hitherto unknown states: a 2Σ state designated by E, which gives rise to the transitions E2Σ → X2Σ and E2Σ → A2Π, and an inverted 2Δ state designated by J, which gives rise to the transition J2Δ → A2Π. Rotational analyses of the bands have been made and the molecular constants evaluated. The new data, although not decisive, support the higher value (8.2 ev.) for the dissociation energy of CN.

scholarly journals Spectrum of the hydroxyl radical

1969 ◽  
Vol 47 (18) ◽  
pp. 1945-1957 ◽  
Author(s):  
C. Carlone ◽  
F. W. Dalby
Keyword(s):  
High Resolution ◽  
Hydroxyl Radical ◽  
Dissociation Energy ◽  
Spin Splitting ◽  
Oh Radical ◽  
Rotational Constants ◽  
Upper Limit ◽  
Vibrational Levels ◽  
State Formula ◽  
Potential Maximum

The B2Σ+ → A2Σ+ and C2Σ+ → A2Σ+ systems of OH and OD were photographed at high resolution. The apparent dissociation energy D0(A2Σ+) is calculated to be (18 847 ± 15) cm−1 for OH and (19 263 ± 15) cm−1 for OD. An upper limit to D0(X2Π3/2) of OH is deduced to be (35 420 ± 15) cm−1. Evidence for a potential maximum in the B2Σ+ state, which is about 100 cm−1 larger than that in the A2Σ+ state, is presented.The broadening of the rotational lines in several bands of both systems has established a strong predissociation of the A2Σ+ state near ν = 5 in OH. The lifetime of these predissociated levels is ≈10−11 s. A definite identification of the predissociating state has not been possible.Newly-discovered vibrational levels in the C2Σ+ state have led to the following constants, in cm−1, of the OH radical in the C2Σ+ state:[Formula: see text]Rotational constants and spin splitting constants in the A2Σ+ and B2Σ+ states, more accurate than previously available, are presented.

ON THE EMISSION SPECTRUM OF THE NEGATIVE GLOW PLASMA OF A HOLLOW‐CATHODE DISCHARGE IN MAGNETIC FIELD

1966 ◽  
Vol 8 (5) ◽  
pp. 103-105 ◽  
Author(s):  
Constantin Popovici ◽  
Maria Someşan
Keyword(s):  
Magnetic Field ◽  
Emission Spectrum ◽  
Hollow Cathode ◽  
Hollow Cathode Discharge ◽  
Negative Glow ◽  
Glow Plasma

Spectroscopic identification of the SiH+ molecule: The A1Π–X1Σ+ system

1970 ◽  
Vol 48 (3) ◽  
pp. 247-253 ◽  
Author(s):  
A. E. Douglas ◽  
Barry L. Lutz
Keyword(s):  
Emission Spectrum ◽  
Ionization Potential ◽  
Hollow Cathode ◽  
Solar Spectrum ◽  
Hollow Cathode Discharge ◽  
Potential Curve ◽  
Dissociation Limit ◽  
Molecular Constants ◽  
State Potential ◽  
Spectroscopic Identification

The A1II–X1Σ+ transition of the SiH+ molecule has been observed in the emission spectrum of a hollow-cathode discharge through helium containing a trace of silane. The analysis of five bands yields the molecular constants Bc″ = 7.6603 cm−1, ΔG″(1/2) = 2088.69 cm−1, Bc′ = 4.9125 cm−1, ΔG′(1/2) = 390.17 cm−1, and v(0–0) = 25 025.20 cm−1. Because of the shallowness of the upper-state potential curve, a good estimate of the dissociation limit is obtained: D00(SiH+) = 3.20 ± 0.08 eV. This dissociation limit leads to an ionization potential of 8.01 ± 0.08 eV of SiH. The SiH+ molecule is tentatively identified in the solar spectrum and the possibility of detecting interstellar SiH+ is briefly discussed.

Spectre d'émission du radical P2 : étude de la transition b′3Σu−–X1Σg+

1974 ◽  
Vol 52 (21) ◽  
pp. 2143-2149 ◽  
Author(s):  
J. Brion ◽  
J. Malicet ◽  
H. Guenebaut
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Electronic Transition ◽  
Spin Splitting ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Vibrational Levels

The emission spectrum of the b′3Σu−–X1Σg+ system between 3540–4375 Å and ascribed previously by Mrozowski and Santaram to the a3Σu+–X1Σg+ transition of the P2 molecule, has been photographed under high resolution. The rotational analysis of 7 bands has been carried out and allowed us to determine the rotational constants of the vibrational levels ν′ = 0, 1, and 2 as well as the spin splitting constants λ′ and γ′. The nature of the upper state has been identified as a 3Σu− state, the electronic transition being analogous to the Ogawa–Tanaka–Wilkinson system of N2.

Comparison of plasma characteristics of high-power pulsed sputtering glow discharge and hollow-cathode discharge

2020 ◽  
Vol 60 (1) ◽  
pp. 015501
Author(s):  
Shoki Abe ◽  
Katsuyuki Takahashi ◽  
Seiji Mukaigawa ◽  
Koichi Takaki ◽  
Ken Yukimura
Keyword(s):  
Glow Discharge ◽  
High Power ◽  
Hollow Cathode ◽  
Hollow Cathode Discharge ◽  
Plasma Characteristics

ROTATIONAL ANALYSIS OF THE β BANDS OF PHOSPHORUS MONOXIDE

1959 ◽  
Vol 37 (2) ◽  
pp. 136-143 ◽  
Author(s):  
Nand Lal Singh
Keyword(s):  
Ground State ◽  
Band System ◽  
Electronic States ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Fine Structures ◽  
Π State

The fine structures of three of the β bands of PO which occur near 3200 Å have been analyzed. The analysis shows that the upper state of this band system is a 2Σ and not a 2Π state as previously believed. The rotational constants of both electronic states have been determined and it is found that the ground state constants, previously determined from the γ bands, are incorrect.

Effect of aging the hollow cathode by sputtering on the analytical precision of the hollow cathode discharge emission source

1992 ◽  
Vol 64 (17) ◽  
pp. 1831-1835 ◽  
Author(s):  
Jih Lie. Tseng ◽  
Jau Yurn. Kung ◽  
J. C. Williams ◽  
Steven T. Griffin
Keyword(s):  
Hollow Cathode ◽  
Hollow Cathode Discharge ◽  
Emission Source ◽  
Analytical Precision

A review of spectroanalytical investigations and applications of a cooled hollow cathode discharge

1981 ◽  
Vol 36 (12) ◽  
pp. 1153-1161 ◽  
Author(s):  
A.I. Drobyshev ◽  
Y.I. Turkin
Keyword(s):  
Hollow Cathode ◽  
Hollow Cathode Discharge
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