An analysis of the ion-pair state of I2 by a sequential three-photon excitation

1993 ◽  
Vol 71 (10) ◽  
pp. 1734-1740
Author(s):  
Faten S.M. Abd El-Hameed
Keyword(s):  
Ion Pair ◽  
Photon Absorption ◽  
Dissociation Limit ◽  
Molecular Constants ◽  
Two Photon Absorption ◽  
Photon Excitation ◽  
Vibrational Levels ◽  
Color Spectrum ◽  
The One ◽  
Pair State

A three-photon absorption technique that utilizes a visible [Formula: see text] transition followed by two-photon absorption was applied to characterize the high-lying vibrational levels of the [Formula: see text] ion-pair state of I2, which correlates with I−(1S) + I+(1D) at the dissociation limit. The multiphoton spectrum was examined at high resolution using either a single tunable dye laser (3P1C), or two independently tunable pump and probe dye lasers (3P2C), operating in the blue–green region. The one-color spectrum excited by a single laser shows transitions that have not been assigned by previous workers; these rotational lines are interpreted as being due partly to 3P1C transitions to the [Formula: see text] ion-pair state, for which molecular constants are derived to be (for ν′ = 60–74, J′ = 3–100):[Formula: see text](all in cm−1 with one standard deviation in the last quoted digit in parentheses).

Theoretical Investigation on the One- and Two-photon Absorption Properties of Porphyrin-thiophene Chromophores

2009 ◽  
Vol 27 (7) ◽  
pp. 1269-1279 ◽  
Author(s):  
Wenchao LI ◽  
Jikang FENG ◽  
Aimin REN ◽  
Xiangbiao ZHANG ◽  
Chiachung SUN
Keyword(s):  
Theoretical Investigation ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
The One

Theoretical studies on the one- and two-photon absorption of tetrabenzoporphyrins and phthalocyanines

2004 ◽  
Vol 82 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Xin Zhou ◽  
Ai-Min Ren ◽  
Ji-Kang Feng ◽  
Xiao-Juan Liu
Keyword(s):  
Dipole Moment ◽  
Cross Sections ◽  
Density Functional ◽  
Transition Dipole Moment ◽  
Photon Absorption ◽  
Transition Dipole ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
The One

The one-photon absorption (OPA) properties of tetrabenzoporphyrins (TBPs) and phthalocyanines (Pcs) were studied using the semiempirical ZINDO method and time-dependent density functional theory (TDDFT), respectively. The compared results confirmed that the semiempirical ZINDO method was reasonably reliable when calculating the OPA of tetrabenzoporphyrins and phthalocyanines. On the basis of the OPA properties obtained from the ZINDO method, two-photon absorption (TPA) properties of two series of molecules were investigated, using ZINDO and sum-over-states (SOS) methods. The results showed that the TPA cross-sections of all molecules were in the range of 220.6 × 10–50 – 345.9 × 10–50 cm4·s·photon–1, which were in the same order of magnitude as the values reported in the literature. The relatively larger δ(ω) value for Pcs with respect to that for corresponding TBPs originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment between S0 and S1 and the transition dipole moment between S1 and S5.Key words: two-photon absorption, ZINDO, sum-over-states, tetrabenzoporphyrin, phthalocyanines.

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.

Two-photon excitation spectroscopy of photosynthetic light-harvesting complexes and pigments

2019 ◽  
Vol 216 ◽  
pp. 494-506 ◽  
Author(s):  
Alexander Betke ◽  
Heiko Lokstein
Keyword(s):  
Spectral Region ◽  
Protein Complexes ◽  
Photosynthetic Pigment ◽  
Photon Absorption ◽  
Light Harvesting Complexes ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Excitation ◽  
Pigment Protein Complexes ◽  
Two Photon Excitation

Two-photon excitation (TPE) profiles of LHCII samples containing different xanthophyll complements were measured in the presumed 11Ag− → 21Ag− (S0 → S1) transition region of xanthophylls. Additionally, TPE profiles of Chls a and b in solution and of WSCP, which does not contain carotenoids, were measured. The results indicate that direct two-photon absorption by Chls in the presumed S0 → S1 transition spectral region of carotenoids is dominant over that of carotenoids, with negligible contributions of the latter. These results suggest the re-evaluation of previously published TPE data obtained with photosynthetic pigment–protein complexes containing (B)Chls and carotenoids.

Computational study of the one- and two-photon absorption properties of macrocyclic thiophene derivatives

2011 ◽  
Vol 91 (2) ◽  
pp. 248-257 ◽  
Author(s):  
Shuang Huang ◽  
Ai-Min Ren ◽  
Lu-Yi Zou ◽  
Yang Zhao ◽  
Jing-Fu Guo ◽  
...  
Keyword(s):  
Computational Study ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Thiophene Derivatives ◽  
The One

Stepwise two-photon excitation of Cl2 to the E(0g+) ion-pair state

1984 ◽  
Vol 107 (4-5) ◽  
pp. 434-437 ◽  
Author(s):  
Takashi Ishiwata ◽  
Ikuzo Tanaka
Keyword(s):  
Ion Pair ◽  
Two Photon ◽  
Photon Excitation ◽  
Pair State ◽  
Two Photon Excitation

Spectral profiles of two-photon absorption: Coherent versus two-step two-photon absorption

2004 ◽  
Vol 846 ◽  
Author(s):  
S. Polyutov ◽  
I. Minkov ◽  
F. Gel'mukhanov ◽  
K. Kamada ◽  
A. Baev ◽  
...  
Keyword(s):  
Cross Sections ◽  
Degrees Of Freedom ◽  
Photon Absorption ◽  
Final State ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Spectral Bands ◽  
Spectral Profiles ◽  
The One ◽  
Spectral Shapes

ABSTRACTWe present a theory of two-photon absorption in solutions which addresses the formation of spectral shapes taking account of the vibrational degrees of freedom. The theory is used to rationalize observed differences between spectral shapes of one- and two-photon absorption. We elaborate on two underlying causes, one trivial and one non-trivial, behind these differences. The first refers simply to the fact that the set of excited electronic states constituting the spectra will have different relative cross sections for one-and two- photon absorption. The second reason is that the two-step and coherent two-photon absorption processes are competing, making the one-and two-photon spectral bands different even considering a single final state. The theory is applied to the N-101 molecule [di-phenyl-amino-nitro-stilbene] which was recently studied experimentally in the paper [ T.-C. Lin, G.S. He, P.N. Prasad, and L.-S. Tan, J. Mater. Chem., 14, 982, 2004.]

Oscillatory continuum fluorescence from high vibrational levels of theE(0+) ion-pair state of IBr

1987 ◽  
Vol 62 (5) ◽  
pp. 1195-1205 ◽  
Author(s):  
K.P. Lawley ◽  
D. Austin ◽  
J. Tellinghuisen ◽  
R.J. Donovan
Keyword(s):  
Ion Pair ◽  
Vibrational Levels ◽  
Pair State

Transient and steady-state behavior of single and two-photon absorption by microwave driven field

2014 ◽  
Vol 92 (4) ◽  
pp. 284-288
Author(s):  
Seyyed Hossein Asadpour ◽  
H. Rahimpour Soleimani
Keyword(s):  
Steady State ◽  
Microwave Field ◽  
Single Photon ◽  
Photon Absorption ◽  
State Behavior ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Probe Gain ◽  
The One ◽  
Transient And Steady State

In this paper, the effect of microwave field on the transient and steady state response of the four-level inverted Y-type atomic system is investigated. It is found that the properties of transient and steady processes can be affected by microwave field. It is found that the absorption spectrum behaves differentially for single-photon absorption and two-photon absorption. Also it is observed that in the one-photon absorption, the microwave field can lead to the probe gain and for two-photon absorption case, the strong microwave can enhance the absorption.

Sign in / Sign up

Export Citation Format

Share Document