Laser-induced fluorescence in sodium (Na2) to bound vibrational levels of the entire potential well and to the continuum

1981 ◽  
Vol 85 (20) ◽  
pp. 2884-2886 ◽  
Author(s):  
K. K. Verma ◽  
J. Bahns ◽  
W. C. Stwalley
Keyword(s):  
Laser Induced Fluorescence ◽  
Potential Well ◽  
Vibrational Levels ◽  
The Continuum

The low‐lying bending vibrational levels of the CCH (X̃ 2Σ+) radical studied by laser‐induced fluorescence

1993 ◽  
Vol 98 (9) ◽  
pp. 6690-6696 ◽  
Author(s):  
Yen‐Chu Hsu ◽  
Jim Jr‐Min Lin ◽  
D. Papoušek ◽  
Jaw‐Jer Tsai
Keyword(s):  
Laser Induced Fluorescence ◽  
Vibrational Levels

Low vibrational levels of the ionic–covalent coupled state A0+ of NaI and its potential function

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1137-1144 ◽  
Author(s):  
J. Lindner ◽  
H. Bluhm ◽  
A. Fleisch ◽  
E. Tiemann
Keyword(s):  
Potential Function ◽  
Spectroscopic Data ◽  
Double Resonance ◽  
Laser Induced Fluorescence ◽  
Potential Functions ◽  
Potential Curve ◽  
Resonance Spectroscopy ◽  
Vibrational Levels ◽  
Double Resonance Spectroscopy

The A0+ state of NaI was investigated towards the minimum of its potential using laser-induced fluorescence and Λ-type double resonance spectroscopy via the covalent C0+ state, because significantly different potential functions were proposed in the literature due to missing spectroscopic data. The vibrational interval νadia = 135–282 measured previously by Schaefer et al. was extended to vibrational levels as low as νadia = 40. Transitions to lower levels are masked by the very strong C0+–B1 transition. An improved potential curve for A0+ was derived. The uncertainty by the unknown lowest vibrational levels is discussed. A comparison of the new curve with others reported in the literature is given.

Quantitative Laser-Induced Fluorescence Measurements of Reactive Species: Spectroscopy and Collision Dynamics of SiCl

1988 ◽  
Vol 117 ◽  
Author(s):  
Jay B. Jeffries
Keyword(s):  
Gas Phase ◽  
Laser Induced Fluorescence ◽  
Rare Gas ◽  
Silicon Etching ◽  
Collision Dynamics ◽  
Species Concentration ◽  
Radical Species ◽  
Fluorescence Measurements ◽  
Vibrational Levels ◽  
Ideal Technique

AbstractLaser-induced fluorescence (LIF) is an ideal technique to determine the gas phase concentration of the chemically reactive radical species in processing plasmas. Quantitative species concentration measurements require spectroscopic and collision dynamics data. Experiments to obtain such data for the B2 and Σ+ B′2 Δ states of SiCl are described. Using LIF, the transition strengths, radiative lifetimes, and collisional removal rates are determined. Collisional transfer between the two excited electronic states, B′→B, shows a very unusual quantum state specificity for the final vibrational levels which is quite different for each of the rare gas collision partners (He, Ne, Ar). Such energy transfer makes the B′2 Δ state unsuitable for quantitative LIF diagnostics; however, the B2Σ+ state appears to be an ideal excited state for LIF diagnostic measurements in silicon etching plasmas.

High resolution laser induced fluorescence spectroscopy of highly excited vibrational levels in NaAr: A2∏r and B2∑+

1986 ◽  
Author(s):  
A. M. Lyyra ◽  
W. P. Lapatovich ◽  
P. E. Moskowitz ◽  
M. D. Havey ◽  
R. Ahmad-Bitar ◽  
...  
Keyword(s):  
High Resolution ◽  
Fluorescence Spectroscopy ◽  
Laser Induced Fluorescence ◽  
Vibrational Levels

Dynamics of the low vibrational levels of Br2B3Pi (Ou+) state by laser induced fluorescence

1991 ◽  
Vol 24 (11) ◽  
pp. 2765-2774 ◽  
Author(s):  
E Martinez ◽  
F J Basterrechea ◽  
J Albaladejo ◽  
F Castano ◽  
P Puyuelo
Keyword(s):  
Laser Induced Fluorescence ◽  
Vibrational Levels

Absorption bands of O2 and OH in a new ultraviolet continuum and in the XeCl laser spectrum

1984 ◽  
Vol 62 (12) ◽  
pp. 1403-1413 ◽  
Author(s):  
M. Shimauchi ◽  
K. Oikawa
Keyword(s):  
Discharge Chamber ◽  
Xecl Laser ◽  
Ultraviolet Continuum ◽  
Absorption Bands ◽  
Third Order ◽  
Laser Spectrum ◽  
Light Pulses ◽  
Vibrational Levels ◽  
Quartz Spectrograph ◽  
The Continuum

Two excimer lasers of the automatic pre-ionization type have been constructed. To avoid impurities, the two series of condensers were placed outside the discharge chamber. Using one of these devices we have observed a new ultraviolet (UV) continuum from a discharge through a He–O2 mixture at 900 Torr. The continuous nature of this emission was assured by the observation of almost 80 absorption bands of the O2 Schumann-Runge system arising from highly excited vibrational levels and of some OH bands in the A–X system. The same type of discharge through pure He emits no continuum but some OH bands. The time dependence of the light pulses was studied to infer the origin of the continuum. Based on these observations, we show that the strong absorption in the B–X, 0–2 band of the XeCl laser is due to the P11, Q13, and Q13′ lines in the 0–0 band of the OH A–X system; the estimated intensity of this absorption amounting to 5–7% of the total intensity of the XeCl laser. The XeCl spectra were photographed on an E1 quartz spectrograph and in the third order of a 6.65 m grating.

The ground state of Na2

1989 ◽  
Vol 67 (9) ◽  
pp. 912-918 ◽  
Author(s):  
O. Babaky ◽  
K. Hussein
Keyword(s):  
Fourier Transform ◽  
Gas Phase ◽  
Ground State ◽  
Laser Induced Fluorescence ◽  
Rotational Relaxation ◽  
Fixed Frequency ◽  
Molecular Constants ◽  
Vibrational Levels ◽  
Laser Frequencies ◽  
Ion Laser

The laser-induced fluorescence of the [Formula: see text] and [Formula: see text] transitions of Na2 are analysed, using high resolution Fourier transform spectroscopy. Fixed-frequency ion-laser lines (4880 and 4765 Å (1 Å = 10−10 m) from Ar+ and 6471 and 4762 Å from Kr+) together with laser frequencies from a ring dye laser, using rhodamine 6 G with λ = 5781.22 and 5796.80 Å, were used to excite Na dimer in the gas phase. Twenty-eight series of [Formula: see text] and [Formula: see text] systems have been assigned and analysed, and the strong transitions are accompanied by numerous rotational relaxation lines. Molecular constants of the [Formula: see text] state were calculated with high precision from simultaneous least-squares fits to 1410 lines assigned to the A–X and B–X systems. These constants have been used to determine the Rydberg–Klein–Rees potential curve of the X ground state for vibrational levels up to ν = 62.

scholarly journals Cross sections for the two-step radiative decay process $$X(v)\rightarrow A(v^{\prime \prime })\rightarrow X(v^\prime )$$ in e-LiH collisions

2021 ◽  
Vol 75 (5) ◽  
Author(s):  
Roberto Celiberto ◽  
Annarita Laricchiuta
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Radiative Decay ◽  
Electronic Excitation ◽  
Vibrational Excitation ◽  
Incident Electron Energy ◽  
Step Process ◽  
Vibrational Levels ◽  
Electronic Ground ◽  
The Continuum

Abstract The cross sections for the two-step process, represented by the electron-impact vibro-electronic excitation $$X^1\varSigma ^+(v) \rightarrow A^1\varSigma ^+(v'')$$ X 1 Σ + ( v ) → A 1 Σ + ( v ′ ′ ) of the LiH molecule, followed by radiative decay back on the vibrational manifold of the ground state, $$A^1\varSigma ^+(v'')\rightarrow X^1\varSigma ^+(v')$$ A 1 Σ + ( v ′ ′ ) → X 1 Σ + ( v ′ ) , are calculated as a function of the incident electron energy from the threshold to 1000 eV. The final cross sections for the two-step process, which results in an overall vibrational excitation of the molecule, known also as E-v process, are provided for all the possible $$v,v'$$ v , v ′ transitions among the vibrational levels, including the continuum, of the electronic ground state. Graphic abstract

Optically pumped ring laser oscillation to vibrational levels near dissociation and to the continuum in Na2

1983 ◽  
Vol 42 (4) ◽  
pp. 336-338 ◽  
Author(s):  
John T. Bahns ◽  
K. K. Verma ◽  
A. R. Rajaei‐Rizi ◽  
W. C. Stwalley
Keyword(s):  
Ring Laser ◽  
Laser Oscillation ◽  
Optically Pumped ◽  
Vibrational Levels ◽  
The Continuum
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