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Related Concept Videos

Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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.
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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 process,...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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.
According to Hooke's law, the vibrational frequency is directly proportional to the...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Updated: Jul 18, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

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Published on: October 9, 2012

Extracting spectroscopic molecular parameters from short pulse photo-electron angular distributions.

R Chamakhi1, R Puthumpally-Joseph2, M Telmini1

  • 1LSAMA, Department of Physics, Faculty of Sciences of Tunis, University of Tunis-El Manar, 2092 Tunis, Tunisia.

The Journal of Chemical Physics
|October 17, 2017
PubMed
Summary

Investigating ultrashort laser pulses on lithium dimer (Li2) revealed that photoelectron angular distributions strongly depend on pulse duration. A new formula helps extract transition parameters from these measurements.

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Area of Science:

  • Quantum dynamics
  • Molecular spectroscopy
  • Ultrafast laser physics

Background:

  • Understanding electron and nuclear dynamics in molecules is crucial for controlling chemical reactions.
  • Photoelectron spectroscopy provides insights into electronic states and molecular dynamics.

Purpose of the Study:

  • To investigate the influence of ultrashort laser pulse duration on photoelectron spectra of the Li2 E(1Σg+) state.
  • To analyze the time-dependent angular distributions of emitted photoelectrons.
  • To develop a method for extracting fundamental spectroscopic parameters from ultrafast measurements.

Main Methods:

  • Quantum wave packet simulations incorporating nuclear and electronic degrees of freedom.
  • Calculation of femtosecond and picosecond energy- and angle-resolved photoelectron spectra.
  • Extraction and analysis of a time-dependent asymmetry parameter.

Main Results:

  • Photoelectron angular distributions exhibit strong dependence on laser pulse duration for ultrashort pulses.
  • The observed variation in the asymmetry parameter is explained by averaging over ion rotational quantum numbers.
  • A simple analytical formula was derived to relate time-dependent asymmetry to asymptotic continuous-wave parameters.

Conclusions:

  • Pulse duration is a critical parameter influencing photoelectron angular distributions in ultrafast spectroscopy.
  • The derived analytical formula enables precise determination of molecular transition parameters using ultra-short pulses.
  • This work provides a pathway for advanced characterization of molecular electronic states and dynamics.