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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Mechanisms of Heat Transfer01:14

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Environment-dependent vibrational heat transport in molecular junctions: Rectification, quantum effects, vibrational

Jayasmita Behera1, Malay Bandyopadhyay1

  • 1SBS, I.I.T. Bhubaneswar, Argul, Jatni, Khurda, Odisha 752050, India.

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Summary

This study investigates nanoscale heat transport in molecular junctions using a quantum self-consistent reservoir model. It reveals how different thermal environments and molecular structures impact thermal rectification and heat current.

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Vibrational heat transport in molecular junctions is crucial for fields like materials science and energy generation.
  • Understanding quantum effects and non-equilibrium conditions is key for nanoscale thermal management.

Purpose of the Study:

  • To investigate quantum effects on thermal conduction in molecular junctions under non-equilibrium conditions.
  • To analyze the influence of different thermal environments and system properties on thermal rectification.

Main Methods:

  • Utilized a quantum self-consistent reservoir model based on a generalized quantum Langevin equation.
  • Modeled thermal environments as Ohmic, sub-Ohmic, and super-Ohmic systems.
  • Investigated systems with spring-graded or mass-graded molecular chains.

Main Results:

  • Demonstrated the impact of thermal environments on thermal rectification properties.
  • Studied heat current behavior concerning chain length, temperature gradient, and phonon scattering rates.
  • Revealed the influence of vibrational mismatch between solids on heat transfer.

Conclusions:

  • The quantum self-consistent reservoir model effectively mimics phonon-scattering mechanisms.
  • System properties and thermal environments significantly alter heat transport and rectification in molecular junctions.
  • Findings provide insights into designing efficient nanoscale thermal management systems.