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Raman Spectroscopy

Raman spectroscopy is a spectroscopic technique used to observe vibrational, rotational, and other low-frequency modes in a system. It relies on inelastic scattering, or Raman scattering, of monochromatic light, usually from a laser in the visible, near infrared, or near ultraviolet range. The laser light interacts with molecular vibrations, phonons or other excitations in the system, resulting in the energy of the laser photons being …

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Planck Constant Measurement

The Planck constant (denoted h, also called Planck’s constant) is a physical constant that is the quantum of action, central in quantum mechanics. This constant determines that the fundamental physical quantities does not vary in a continuous way, but are quantized, that is they can only take on multiple values ​​of this constant .

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Atomic Spectroscopy

The emission spectrum of a chemical element or a chemical compound is the set of frequencies of the electromagnetic radiation emitted by the electrons of its atoms when they perform a transition from one state to a higher energy towards a lower energy . For each transition between states, the energy of …

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DIY Webcam Diffraction Grating Spectrometer

In this post we propose the construction of a diffraction grating spectrometer based on webcam and software Theremino Spectrometer. The spectrometer is a fundamental tool that allows measurement of the spectrum of a light source, ie the properties of light as a function of its wavelength. The spectrometer that we …

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Quantum Dots : a True “Particle in a Box” System

A quantum dot (QD) is a crystal of semiconductor material whose diameter is on the order of several nanometers – a size which results in its free charge carriers experiencing “quantum confinement” in all three spatial dimensions. The electronic properties of quantum dots are intermediate between those of bulk semiconductors and of discrete molecules and closely related to …

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