Photodissociation of superexcited states of hydrogen iodide: A photofragment imaging study using resonant multiphoton excitation at 13.39 and 15.59 eV

2001 ◽  
Vol 79 (2-3) ◽  
pp. 211-227 ◽  
Author(s):  
H -P Loock ◽  
B LG Bakker ◽  
D H Parker
Keyword(s):  
Excited States ◽  
Iodine Atom ◽  
Imaging Study ◽  
Local Interaction ◽  
Hydrogen Iodide ◽  
Multiphoton Excitation ◽  
Velocity Mapping ◽  
Weakly Bound ◽  
Excitation Scheme ◽  
Photon Excitation

Jet-cooled HI has been excited using a resonant three-photon excitation scheme to energies corresponding to 13.39 and 15.59 eV. Analysis of velocity mapping images of the iodine atom fragments allowed the identification of the HI excited states at these energies as the (4Σ–1/2) 6p superexcited state and the repulsive 4Σ–1/2 state of HI+, respectively. Following excitation at 13.39 eV, we observe formation of iodine atomic fragments through the H(2S) + I[(3PJ) 6p] (J = 0, 1, 2) fragment channels, as well as through the H(2S) + I[(1D2) 6p] channel. This observation is explained by extensive nonadiabatic interactions between the (4Σ–1/2) 6p state with the repulsive (4Π1/2) 6p state and the weakly bound (A 2Σ+) 6p state. In support for this proposed dissociation mechanism excitation of the corresponding ionic 4Σ–1/2 state at 15.59 eV also results in formation of comparable quantities of I+ in its 1D2, 3P0,1, and 3P2 levels indicating again extensive nonadiabatic interactions with other repulsive curves. A similar mechanism based on the local interaction of the 4Σ–1/2 state with the A 2Σ+ and the 4Π1/2 state is proposed. PACS Nos.: 82.50F, 32.80R

scholarly journals Modelling excited states of weakly bound complexes with density functional theory

2014 ◽  
Vol 16 (28) ◽  
pp. 14455-14462 ◽  
Author(s):  
Edward A. Briggs ◽  
Nicholas A. Besley
Keyword(s):  
Density Functional Theory ◽  
Excited States ◽  
Density Functional ◽  
Rydberg State ◽  
Dispersion Correction ◽  
Weakly Bound ◽  
Functional Theory ◽  
Weakly Bound Complexes

Different dispersion correction parameters are required to describe the interaction when the molecule is in an excited Rydberg state.

Fluorescence anisotropy in indole under two-photon excitation in the spectral range 385–510 nm

2018 ◽  
Vol 20 (30) ◽  
pp. 19922-19931 ◽  
Author(s):  
M. E. Sasin ◽  
A. G. Smolin ◽  
K.-H. Gericke ◽  
E. Tokunaga ◽  
O. S. Vasyutinskii
Keyword(s):  
Propylene Glycol ◽  
Excited States ◽  
Spectral Range ◽  
Ground State ◽  
Fluorescence Anisotropy ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Excitation ◽  
Molecular Ground State

This paper presents the detailed study of two-photon excited fluorescence in indole dissolved in propylene glycol produced by two-photon absorption from the molecular ground state to several high lying excited states.

scholarly journals Universality of excited three-body bound states in one dimension

2021 ◽  
Author(s):  
Lucas Happ ◽  
Matthias Zimmermann ◽  
Maxim A Efremov
Keyword(s):  
Excited States ◽  
Bound States ◽  
Space Dimension ◽  
Binding Energies ◽  
Wave Functions ◽  
One Dimension ◽  
Strong Indication ◽  
Body System ◽  
Weakly Bound ◽  
Three Body

Abstract We study a heavy-heavy-light three-body system confined to one space dimension in the regime where an excited state in the heavy-light subsystems becomes weakly bound. The associated two-body system is characterized by (i) the structure of the weakly-bound excited heavy-light state and (ii) the presence of deeply-bound heavy-light states. The consequences of these aspects for the behavior of the three-body system are analyzed. We find a strong indication for universal behavior of both three-body binding energies and wave functions for different weakly-bound excited states in the heavy-light subsystems.

scholarly journals Resonant excitation of nanowire quantum dots

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Lorenzo Leandro ◽  
Jacob Hastrup ◽  
Rodion Reznik ◽  
George Cirlin ◽  
Nika Akopian
Keyword(s):  
Quantum Dots ◽  
Resonant Excitation ◽  
Resonance Fluorescence ◽  
Excitation Scheme ◽  
Two Photon ◽  
Photon Excitation ◽  
Technological Potential ◽  
Gaas Quantum Dot ◽  
Quantum Photonics ◽  
First Time

AbstractGaAs quantum dots in nanowires are one of the most promising candidates for scalable quantum photonics. They have excellent optical properties, can be frequency-tuned to atomic transitions, and offer a robust platform for fabrication of multi-qubit devices that promise to unlock the full technological potential of quantum dots. Coherent resonant excitation is necessary for virtually any practical application because it allows, for instance, for on-demand generation of single and entangled photons, photonic clusters states, and electron spin manipulation. However, emission from nanowire structures under this excitation scheme has never been demonstrated. Here we show, for the first time, biexciton–exciton cascaded emission via resonant two-photon excitation and resonance fluorescence from an epitaxially grown GaAs quantum dot in an AlGaAs nanowire. We also report that resonant excitation schemes, combined with above-bandgap excitation, can be used to clean and enhance the emission of nanowire quantum dots.

How Multiphoton Excitation can Illuminate Biophysics

1997 ◽  
Vol 3 (S2) ◽  
pp. 299-300
Author(s):  
W. W. Webb
Keyword(s):  
Fluorescence Microscopy ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Infrared Light ◽  
Focal Volume ◽  
Multiphoton Excitation ◽  
Fluorescence Excitation ◽  
Photon Excitation ◽  
Rate Of Absorption ◽  
Molecular Excitation

Multiphoton molecular excitation by the strongly focused femtosecond pulses of infrared light generated as an 80 MHZ pulse train by a mode locked laser provides intrinsic submicron three dimensional spatial resolution of fluorescence excitation and photochemistry for laser scanning fluorescence microscopy. Because two-photon excitation requires simultaneous (∼10-16 seconds), absorption of two-photons focused laser intensities of about 1022 photons/cm2s are required. Since the rate of absorption is proportional to the square of the intensity, excitation is limited to the focal volume and is negligible elsewhere along the double cone of the focused illumination. Therefore, out of focus photodamage and fluorescence are generally negligible and laser scanning fluorescence microscopy with multiphoton excitation is intrinsically three dimensionally resolved with no out of focus background. Since the appropriate wave lengths are infrared for multiphoton excitation of ultraviolet or visible absorbing molecules, out of focus photodamage is eliminated. This allows imaging of useful ultraviolet absorbing indicators, vital DNA stains and autofluorescence in living cells with minimal, but not necessarily negligible, photodamage.

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