Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"singlet states"”.
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Quantum error modelling and correction in long distance teleportation using singlet states
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Picosecond studies of free radical reactions in solution
… diaryl carbenes react with methanol via their singlet states.
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Solute effects on the production and decay of primary species in the flash photolysis of indole
… and CdSO^, direct excitation occurs to CTTS states as well as to first excited singlet states. It is further suggested that in solutions containing NaBr, direct excitation to first excited singlet states predominates. This difference serves to explain increased indole triplet state production …
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Rotation-electronic interaction in the 3p-complex Rydberg state of water
… theory for transitions to the Rydberg p-complex singlet states is presented and selection rules in terms of symmetry species of energy states are established. Finally, applications to HpO and DpO are given.
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Topics in the Theory of Bose -Einstein Condensates With a Spin Degree of Freedom
… distinguish between the so-called coherent and singlet states. We find that this kind of measurement cannot distinguish between the two states in question. We then consider a different experiment based on the interference between spinor condensate. It turns out that interference experiments …
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Quantum Mechanical Study of Spin-Forbidden Reactions in Organometallic Catalysis and Astrochemistry
… coupling of the triplet state to the quintet and singlet states. The calculated spin-orbit coupling values at the minimum energy crossing point geometries between the quintet-triplet and triplet-singlet potential energy surfaces indicate a strong coupling between these electronic states. This is …
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An equation for meson states in the quark model and its application to a meson bootstrap
"A differential equation for meson states is derived from the Bethe-Salpeter equation under the conditions of the quark model. The equation is shown to imply mass relations of the form K* 2 - P2 = K2 2 - 1£ • The equation is used to attempt bootstrap calculations of the vector and pseudo-scalar …
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Investigation of the Photophysical Properties of pi-Conjugated Polymers. A Study by Non-Linear, Time-Resolved, and Single-Molecule Spectroscopy
… functions of the lowest electronically excited singlet states were studied. It was found that the symmetry selection rules for optical transitions are rather strictly fulfilled, demonstrating the high intra-chain order in MeLPPP. Additionally, these data gave evidence that the energies of the …
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Polarization of certain conjugated systems
… were used to examine the polarization of excited singlet states of twisted conjugated systems. This study began as an investigation of systems which are symmetric about a central double bond. Symmetry requires that when twisting about such a bold, there must be a crossing of two low-lying states. …
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Investigating the 4-point truncation of the JIMWLK evolution equation
… We then construct a suitable basis for adjoint singlet states, which may help isolate iterated 2-point contributions, and leverage Hermitian Young Projection Operators and transition operators—key tools in the 4-point truncation studied by J. Alcock-Zeilinger and H. Weigert. Applying the 4-point …
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Ultrabright source of polarization-entangled photons from cavity-enhanced downconversion
… consisting of a combination of triplet and singlet states that depends on the time separation of the pair as it leaves the cavity. The observed results corroborate detailed predictions of a Gaussian-state model of cavity-enhanced downconversion.
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Electrical and optical properties of novel phthalocyanine compounds for sensor devices.
… (T > 162K) relates to the distance of singlet states below the conduction band. The low temperature activation energy indicates hopping conduction between localised states close to the Fermi level. Visible optical absorption and transmission spectra are obtained for 50nm thick sublimed …
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Electrical and optical properties of novel phthalocyanine compouns for sensor devices
… (T > 162K) relates to the distance of singlet states below the conduction band. The low temperature activation energy indicates hopping conduction between localised states close to the Fermi level. Visible optical absorption and transmission spectra are obtained for 50nm thick sublimed …
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Singlet Exciton Fission in Acene Dimer and Diradicaloid Molecules
… of triplet excitons following photoexcitation, singlet exciton fission, in three different acene dimers and diradicaloids. In pentacene and tetracene dimers, we investigate their mechanism of singlet fission. In a series of diradicaloids, we study the relation between molecular structure, …
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Ab Initio Studies of Intramolecular Proton Transfer and Electronic Relaxation
… and a twisted intersection of the first three singlet states (3SI). Closer examination established the connectivity of all of the known intersection extrema spanning the first three states in malonaldehyde. The impact of direct connection of S2 to S0 through the 3SI was probed with AIMS …
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Security Protocols in Relativistic Quantum Cryptography
… In Chapter 2, we examine the concept of singlet testing through discussion of two schemes: the Braunstein-Caves and Random Measurement tests. These schemes allow trusted parties to verify the presence of entangled singlet states through the use of simple quantum tools. Through statistical …
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Quantum Beat Spectroscopy and Radiationless Transitions
… concerning the density of interacting states and the average intramolecular coupling energies. The simpler beat patterns can be analyzed using a perturbation theory approach and the more complex beat patterns of biacetyl were analyzed using a method based on the properties of random …
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Coherence and Singlet Fission of TIPS-Pentacene Probed by Two-dimensional Electronic Spectroscopy
… 2DES to detect correlation between species or states of the system, which manifests as cross peaks in the 2DES data. Additionally, the broadband pulses allow excitation to a quantum superposition of states, a phenomenon known as coherence. This manifests as oscillatory features in the 2DES data …
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New perspectives on fractional quantum Hall physics
… four decades ago, fractional quantum Hall (FQH) states continue to provide platforms for the discovery of novel physical phenomena. In this thesis, I present a study of these remarkable phases of matter from three perspectives: (1) the role of an underlying lattice and its symmetries in …
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Entanglement, topology, & renormalization
… its uses for describing underlying structure of states. We begin this journey by focusing on topological quantum field theory in chapters 1 and 2. These chapters are based heavily upon the papers [1] and [2, 3], respectively. In the introduction to chapter 1 we take the opportunity to recall the …
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