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

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 Dynamics of the B 3Π(0u+) and A 3Π(1u) States of Chlorine by Laser Induced Fluorescence

1992 ◽  
Vol 12 (1-2) ◽  
pp. 75-84 ◽  
Author(s):  
E. Martínez ◽  
F. J. Basterrechea ◽  
B. Cabañas ◽  
P. Puyuelo ◽  
M. R. López
Keyword(s):  
Radiative Lifetime ◽  
Laser Induced Fluorescence ◽  
Trial And Error ◽  
Interference Effects ◽  
A Value ◽  
Vibrational Levels ◽  
Franck Condon

Chlorine B 3Π(0u+) state lifetimes have been measured by laser-induced fluorescence in several predissociated (υ′ = 14–19,21) and non-predissociated (υ′ = 5–12) levels. Trial and error Franck-Condon calculations have been performed to check the nature and position of the predissociating state. The results have been used to give a value of Re for the A 3Π(1u) state responsible for predissociation, Re = 2.48 ± 0.01 Å. The obtained data show that interference effects due to crossing between B and A states modify the lifetimes of the B state appreciably. The inadequacy of the low-lying vibrational levels region, i.e. υ′ < 8, to measure the radiative lifetime of the B state (τR(B)) is shown. Previous values for τR(B) can therefore be affected by considerable errors.

scholarly journals Lifetime Measurements Of CaCl∗(A2Π) In A Molecular Beam

1990 ◽  
Vol 10 (4) ◽  
pp. 239-246 ◽  
Author(s):  
E. Verdasco ◽  
V. Sáez Rabanos ◽  
H. H. Telle ◽  
A. GonzáLez Urena
Keyword(s):  
Molecular Beam ◽  
Laser Induced Fluorescence ◽  
Lifetime Measurements ◽  
Vibrational Levels

An effusive thermal molecular beam of CaCI was produced vapourizing a mixture of Ca and CaCI2 within a crucible with subsequent expansion into vacuum. Lifetimes of CaCl∗(A2Π) in its two lowest vibrational levels were measured under collision-free conditions using laser-induced fluorescence, and values around 33 ns are found; these are discussed with respect to other available data.

scholarly journals Laser Induced Fluorescence of N2+(X,v") Resulting From the Thermal Energy Dissociative Charge Transfer Reaction He++N2O→N2++O+He

1989 ◽  
Vol 10 (1) ◽  
pp. 1-15 ◽  
Author(s):  
j. Lemaire ◽  
R. Marx ◽  
F. Morlet Savary
Keyword(s):  
Charge Transfer ◽  
Thermal Energy ◽  
Transfer Reaction ◽  
Laser Induced Fluorescence ◽  
Rotational Energy ◽  
Relaxation Processes ◽  
Ion Cyclotron Resonance ◽  
Charge Transfer Reaction ◽  
Vibrational Levels ◽  
Resonance Cell

The vibrational (and rotational) energy distribution of N2+(X) ions produced in the He+/N2O charge transfer reaction at thermal energy has been measured by laser induced fluorescence using an Ion Cyclotron Resonance cell to store the ions. Vibrational levels up to V"=5 have been observed.The relaxation processes experienced by the N2+ (X) ions before laser detection are discussed.

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