Experimental And Theoretical Studies Of Quantum Beats In Fluorescence

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Experimental studies of dynamics in gas-phase diatomic molecules

Experimental studies of dynamics in gas-phase diatomic molecules. From lifetime- measurements of BaF to femtosecond pump-probe Spectroscopy of Rb2 Niklas Gador -1 01 23 45 100 150 200 250 300 Signal [photon counts] Delay time [ps] Licentiate theses Department of atomic and Molecular Physics Royal Institute of Technology SCFAB Stockholm, June 2002

F~mtochemistry and Femtobiology

Experimental and Theoretical Study of Quantum Control by Chirped Pulse Excitation 494 D. Huppert, J. Segal and B. D. Fainberg Adapting Optimal Control Theory to a Variety of Molecula r Applications 505 R. De Vivie-Riedle, T Hornung, A. Hofmann and C. Tesch Preparing Arbitrary Superposition States With Minimun Number of Laser Pulses: The Carp

Picosecond Phenomena m

Picosecond Resolution Studies of Ground State Quantum Beats and Rapid Collisional Relaxation Processes in Sodium Vapor By R.K. Jain, H.W.K. Tom, and J.C. Diels 250 Part V Picosecond Chemical Processes Unimolecular Processes and Vibrational Energy Randomization By R.A. Marcus 254 Picosecond Dynamics of Ϊ£ Photodissociation.

Molecular Vibration Dynamics In Molecule Surface Interactions

The experimental work is supported by theoretical studies using time-dependent quantum wavepacket calculations, which provide insight into energy flow among the vibrational modes of polyatomic molecules and interference effects in multiple-surface dynamics.


tion has also made it possible to observe quantum beats in the fluorescence from magnetically oriented atoms. Any one of the above-described characteristics would make synchro-tron radiation an important experimental tool. The combination of all makes it an ideal source for an extremely broad, interdisciplinary range

Phase and amplitude variations of optically induced spin

time-dependent oscillation in the fluorescence signal.' For the theoretical analysis of such quantum-beat experi-ments in the excited state it is usually assumed that the intensity of the driving light field is well below the satura-tion level so that the resulting signal is linear in the laser intensity.

REPORTS Engineering Coherence Among Excited States in

ously assigning quantum beats to electronic co-herences. Molecular heterodimers have recently been the subject of theoretical studies (15, 20), but complementary experimental results are es-sential to our understanding of energy transfer and nonlinear spectroscopy. We chose to use variably substituted fluores

TU Dortmund

intensity, for different Larmor frequencies. The experimental results are shown together with a least squares fit to the theoretically predicted behaviour. The measured FIDS are related to previous theoretical studies on laser saturation effects in quantum beats from an excited atomic state5 where a regeneration of oscillating sublevel

Mössbauer spectrometry as a tool for study of solid state

1) Theoretical background of Mössbauer effect 2) Application potential advantages and disadvantages of MS 3) Experimental setups and fields of their application 4) Hyperfine interactions and their connection to physical quantities 5) Mössbauer spectrometry in specific conditions 2

12. 5 Magnetic Field Effects in the Ion-pair Recombination

Quantum beats in radical recombination®. The simultaneous formation of an ensemble of such pairs in a certain spin state is a necessary condition for experimental observation of quantum beatsp). This condition can be realized in practice if geminate radical pairs are generated by pulse ionizing radiation

The absolute value of the quantum yield of the fluorescence

sive studies. Quantum beats were observed, 1,2 the molecular eigenstate (ME) spectrum is known in great detail3,4 and it has recently become possible to find the energies of the zero order states and the coupling elements between them.5,6 A problem still remains with the value of the quantum yield and with the nature of the interactions observed.

Lifetime measurement of the 9s level of atomic francium

We search for quantum beats in the fluorescence de-cay signal but do not observe any. We measure the lifetime as a function of the magnetic gradient and ex-trapolate to a zero field. The extrapolation is consis-tent with no change. We calculate an upper bound for the expected quantum beat signal following Ref. 5 and

Coherent Control of Decoherence

herence in spin-based quantum gates (27,24). An important conclusion of these theoretical studies, which is confirmed by our experimental results, is that the coherent preparation of quantum states can substantially alter the outcome of the sub sequent nonunitary dynamics induced by the un controlled environment. Moreover, the method of

trans-Stilbene: A Rigid, Planar Asymmetric Top of So S

and of rotational quantum beats in the time-resolved fluorescence decay of tS,6 suggest that the molecule is a planar, centrosym- metric species low in the vibrational manifolds of its So and Si states. Nonetheless, partly because the frequency-resolved spectra exhibit significant low-frequency mode activity, the image of tS


theoretical thinking on IVR, each of which was suggested to some degree by the experimental achievements at the time. While the experimental situation has been reviewed many times (e.g., Parmenter [1982,1983], Smalley [1982],Bondybey [1984]), it seems that the various theoretical views of the process have not been collected in one place before.

Ultrafast Spectroscopy of Atomic and Molecular Quantum Dynamics

This thesis is devoted to real time studies of molecular and atomic quan-tum dynamics. In the experimental studies sufficient time resolution which facilitates observation of the fast dynamics is obtained the use of ultrashort laser pulses. Hence we have worked in the realm of ultrafast spectroscopy

Ultrafast dissociation features in RIXS spectra of the water

studies of gas phase O 2 and N 2, we have gained information on the effect of parity on RIXS selection rules,6 quantum beats,3 the potential energy surface (PES)1 and ionisation thresholds.2 In liquids, the potential energy surface and molecular dynamics have been investigated for acetone and water,7,9 as well as the

Magnetic dipolar interaction between correlated triplets

sublevels can be monitored through quantum beating signals in the singlet population9, 16, 26. As depicted in Fig. 1a, exciton fusion from two ME sublevels induces quantum beats in population of the S1 state, manifesting themselves as an oscillation in the time-resolved fluorescence (TRFL) spectrum. After first introduced in 1980s 26, this

Femtosecond Real-Time Probing of Reactions. 20. Dynamics of

restricted form of fluorescence quantum beats is observed well below the isomerization barrier, at an excess energy of 396 cm-1,22 and beating fluorescence is common between 663 and 1170 cm-1.6 IVR becomes dissipative (no major recurrences within the excited state lifetime of 2.7 ns) above 1200 cm-1,6 near the energy of the isomerization barrier.

Experimental and Theoretical-studies of the 4s2 N P 2p

Experimental and Theoretical Studies of the 4s 2 n p 2p Sequence The fluorescence light from an excited state passed quantum beats. The lifetime values of both

630 orig 638.

2, with the amplitude of quantum beats in the fluorescence signal used as an easily measured surrogate for the purpose of optimizing coherence. The optimal pulse increased the beat amplitude from below the noise level to well above it, and thereby increased the coherence life time as compared with the beats produced by a transform-limited pulse.

The structures of fluorene (H2O)1,2 determined by rotational

cus of a number of experimental. 1 11. and theoretical. 8,12 16. studies aimed at understanding the interaction between hy-drogen bonding species and aromatic psystems. Benzene (H. 2. O) n. complexes up to n58 and several isotopomers of the benzene water complex have been studied with microwave, 7,8. partially rotationally resolved

Dressing up atoms to explain resonance fluorescence

Quantum beats and localization of two atoms in the subwavelength regime N Ciobanu, N A Enaki and M Orszag-Dressed-atom description of resonance fluorescence and absorption spectra of a multi-level atom in an intense laser beam C Cohen-Tannoudji and S Reynaud-Theory of generalized damping and quantum interference in multi-level atomic systems

Optical Selectlvity and Absence of Intramolecular Vibrational

processes. Time-resolved spectra (eq 16) show quantum beats in this case. Finally, in case C the IVR becomes irreversible, I',(wL) is constant independent on wL, and so is the yield (eq 11). In this case, the yield is dynamical in nature and reflects the rate of IVR relative to the radiative width y. The experiments on

PCCP - pubs.rsc.org

calculated lifetime of the S 2 state is quite close to the experimental values of 20 ± 10 fs by Stert et al.12 and 22 ± 3 fs by Suzuki et al.13 as well as the theoretical value of about 20 fs.24,26,27 It should be noted that the experimental and theoretical values of the lifetime, which were referred to for


My research is principally concerned with fundamental problems, both experimental and theoretical, in quantum physics, nuclear physics, optics, gravitation & astrophysics. Some examples past and present: Experimental studies: accelerator-based atomic spectroscopy; pulsed laser studies of highly

Highly Excited Molecules

the theoretical and experimental chemistry community are brought together in these studies. This article considers experimental and theoretical work related to the description of highly excited states in four broad areas: highly excited bound vibrational states, unimolecular decay, collisional energy transfer and bimolecular reactions. For

Generating Molecular Rovibrational Coherence by Two-Photon

rovibrational coherence is probed by a time-delayed third photon, resulting in quantum beats in the UV fluorescence. A comprehensive theoretical model based on ab initio calculations rationalizes the generation of coherence by Franck-Condon filtering of collision energies and partial waves, quantifying

On Readout of Vibrational Qubits Using Quantum Beats

in the number of qubits compared to two-level systems. In this theoretical work, we explore the process of readout from vibrational qubits in thiophosgene molecule, SCCl 2, using quantum beat os-cillations. The quantum beats are measured by first exciting the superposition of the qubit-encoding


approaches, and some new aspects relating to the quantum statistics of the fields are described. Moreover, we have predicted new classes of experiments, such as fluorescence beats and two-photon ionization, in which collision induced resonant structures should be observed. Duncan Steel has indicated

Coherent control of terahertz emission and carrier

quantum beats between these two levels followed by an os-cillating dipole moment. These quantum beats are usu-ally called charge oscillations and lead to the emission of electromagnetic radiation at a frequency corresponding to the quantum-beat period. Thus quantum beats and radiating charge oscillations are not synonyms: the lat-

Introduction To Thz Wave Photonics

May 15, 2021 atoms. The major advances described include the development and implementation of a new technique for THz imaging using atomic fluorescence; the demonstration of a THz-driven phase transition in room-temperature atomic vapour; and a novel method for probing the excited-state dynamics of atoms using quantum beats.

Determination of lifetimes and hyperfine structures of the 8

for which hitherto only theoretical estimates have been available. The states in question are 8,9 and 10 2D3/2 of 133Cs. Studies of some S states will be reported separately. Fluorescence from these states was generated by the method of stepwise excitation. The first step, from the ground state 6 'SlI2 to the 6 2P states, was accomplished by con-

Radiative lifetime and Landé-factor measurements of the Se I

Experimental transition probabilities, when compared with theore-tical values, provides sensitive testing of theoretical atomic wavefunctions. It is especially sensitive to the outer pan of the wavefunctions because of the r weighting. 22 Quantum-beat through pulsed optical excitation If the Fourier-limited spectral bandwidth Aw * 1/At (At pulse

Hyperfine-structure study in the P sequence of 23 Na using

into four HFS levels, characterised by the quantum number F, ranging from 3 to 0. The intervals AE between two adjacent levels can be expressed in terms of the magnetic- dipole and the electric-quadrupole interaction constants a and b : AE2-1 = 2a - b (Kopfermann 1958). The selection rules for HFS quantum beats are AF = *l, 12, and

Curriculum Vitae - SABYASACHI BARIK Department of Physics

and generated data were compared with the experimental one. Then direct measurement of the non linear refractive index was done with beats and amplitude modulation which we call beat technique. The experimental data were matched to theoretical data. Further aim is to address the Lorentz

Contributors p. xiii

Studies of Atoms p. 305 Studies of Molecules p. 314 Metrology p. 318 Summary and Outlook p. 319 References p. 320 Quantum-Beat, Level-Crossing, and Anticrossing Spectroscopy Introduction p. 325 Quantum Beats p. 325 Hanle Effect and Level-Crossing Spectroscopy p. 332 Anticrossing Spectroscopy p. 335 References p. 339 Atom Interferometry