Nonresonant multiphoton excitation spectra of atomic 7Li

2001 ◽  
Vol 79 (7) ◽  
pp. 991-998 ◽  
Author(s):  
M K Ballard ◽  
R A Bernheim ◽  
P Bicchi
Keyword(s):  
Stark Effect ◽  
Rydberg States ◽  
Fluorescence Excitation Spectrum ◽  
Nanosecond Laser ◽  
Rydberg Series ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Quantum Numbers ◽  
Ac Stark Effect ◽  
Polarized Radiation

The nonresonant multiphoton laser-induced fluorescence excitation spectrum of isotopically purified 7Li was obtained with a tunable, pulsed, nanosecond laser scanned between 13 600 and 14 500 cm–1. The measured Rydberg series include n 2P [Formula: see text] 2 2S, n 2F [Formula: see text] 2 2S, n 2P [Formula: see text]2 2P, and n 2F [Formula: see text] 2 2P, and term values up to 14 2P and 28 2F were determined. Features due to the ac Stark effect become prominent for the high Rydberg states, but can be eliminated by using circular instead of plane-polarized radiation. Quantum defect values for the n 2P, n 2D, and n 2F levels were determined. Those for the n 2F states cover a range of principal quantum numbers not previously investigated. PACS Nos.: 32.80Rm, 32.30Jc, 32.70Jz

Isotope shifts in the Cl2B–X system

1988 ◽  
Vol 66 (8) ◽  
pp. 721-723
Author(s):  
G. Gouédard ◽  
N. Billy ◽  
B. Girard ◽  
J. Vigué
Keyword(s):  
Excitation Spectrum ◽  
Fluorescence Excitation Spectrum ◽  
Abundant Species ◽  
Precise Determination ◽  
Dye Laser ◽  
Fluorescence Excitation ◽  
Isotope Shifts ◽  
Quantum Numbers ◽  
Interpolation Procedure

We have studied the fluorescence excitation spectrum of natural Cl2 molecules induced by a monomode ring dye laser around various X(ν″ = 0) → B(ν′ ≥ 18) bandheads. Contrary to the main 35–35Cl2 isotope, the less abundant species 35–37Cl2 and 37–37Cl2 have not, up to now, been thoroughly investigated in this region. Our experiment has allowed a precise determination of a number of isotope shifts, which are shown to be calculable by a local interpolation procedure of Coxon's data, using the concept of mass-reduced quantum numbers.

The Position of Carotene in the D-1/D-2 Sub-Core Complex of Photosystem II

1988 ◽  
Vol 43 (3-4) ◽  
pp. 226-230 ◽  
Author(s):  
S. S. Brody
Keyword(s):  
Low Temperature ◽  
Photosystem Ii ◽  
Fluorescence Spectrum ◽  
Fluorescence Excitation Spectrum ◽  
Core Complex ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Pheophytin A ◽  
Long Wavelength ◽  
Β Carotene

When the sub-core complex of photosystem II, D1/D2, is irradiated at 436 or 415 nm (absorption by chlorophyll and pheophytin and β-carotene) or 540 nm (absorption primarily by pheophytin), the low temperature fluorescence spectrum has two maxima, at 685 and 674 nm. This shows the existence of at least two different fluorescent forms of chlorophyll (chlorophyll a and perhaps pheophytin a). When carotene is irradiated at 485 nm (absorption primarily by β-carotene), only fluorescence at 685 nm is observed: this indicates that carotene is transferring energy to only the long-wavelength form of chlorophyll in the D1/D2 sub-core complex. The band of carotene (at 485 nm) does not appear in the fluorescence excitation spectrum, measured at 674 nm. The position of the carotene molecule relative to each of the fluorescent forms of chlorophyll was determined from the excitation spectra of each of the fluorescence bands.

Multiphoton LIF in atomic 6Li

1994 ◽  
Vol 72 (11-12) ◽  
pp. 808-811 ◽  
Author(s):  
M. K. Ballard ◽  
R. J. Hoobler ◽  
Chun He ◽  
L. P. Gold ◽  
R. A. Bernheim ◽  
...  
Keyword(s):  
Excitation Spectrum ◽  
Transition Probabilities ◽  
Fluorescence Excitation Spectrum ◽  
Laser Induced Fluorescence ◽  
Nanosecond Laser ◽  
Laser Polarization ◽  
Fluorescence Excitation ◽  
Multiphoton Transition

The multiphoton laser-induced fluorescence excitation spectrum of 6Li vapor has been measured with a tunable, pulsed, nanosecond laser scanned between 13 600 and 14 500 cm−1. Two- and three-photon allowed excitation transitions originating from the 22S and 22P levels were observed, the latter likely originating from photodissociation products of Li2. Laser polarization and power dependencies are consistent with the multiphoton transition probabilities. Evidence for a parity "forbidden" multiphoton transition is also present.

scholarly journals Fluorescence Excitation Spectrum, Lifetimes and Photoisomerization of Jet-Cooled Conformers of 1,1´-bi(benzocyclobutylidene)

2002 ◽  
Vol 216 (5) ◽  
Author(s):  
D. Ernst ◽  
L. Rupp ◽  
R. Frank ◽  
W. Kühnle ◽  
P. Lemmen ◽  
...  
Keyword(s):  
Excitation Spectrum ◽  
Parent Compound ◽  
Fluorescence Excitation Spectrum ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra

First measurements of fluorescence excitation spectra of the recently synthesized rigid stilbene analogue 1,1´-bi(benzocyclobutylidene) in asupersonic jet expansion show that, in contrast to the parent compound, both the

scholarly journals Intracellular pH-determination by fluorescence measurements.

1979 ◽  
Vol 27 (1) ◽  
pp. 32-35 ◽  
Author(s):  
J W Visser ◽  
A A Jongeling ◽  
H J Tanke
Keyword(s):  
Intracellular Ph ◽  
Bone Marrow Cells ◽  
Fluorescence Excitation Spectrum ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Ph Values ◽  
Fluorescence Measurements ◽  
Fluorescence Excitation Spectra ◽  
The Media ◽  
Ph Dependent

A method was developed to determine the intracellular pH (pHi) of individual cells by use of fluorescence measurements. The method is based on the observation that the fluorescence excitation spectrum of fluorescein is pH-dependent. Fluorescence excitation spectra from individual rat bone marrow cells treated with fluorescein diacetate (FDA) were compared with those of fluorescein solutions of known pH values. Cells which were suspended in media of pH between 4.0 and 8.1 with high to normal buffering capacities had pHi values equal to those of the media. Cells suspended in media with low buffering capacities maintained a pH,i of 6.7 +/- 0.2. Preliminary results indicated that the pHi of individual cells may also be determined by using flow cytometry.

Perturbative calculation of the ac Stark effect by the complex rotation method

1991 ◽  
Vol 43 (11) ◽  
pp. 6272-6283 ◽  
Author(s):  
Liwen Pan ◽  
K. T. Taylor ◽  
Charles W. Clark
Keyword(s):  
Stark Effect ◽  
Perturbative Calculation ◽  
Complex Rotation ◽  
Rotation Method ◽  
Ac Stark Effect
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