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Related Concept Videos

Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...

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

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

Temperature dependence in atom–surface scattering.

Eli Pollak1, J R Manson

  • 1Chemical Physics Department, Weizmann Institute of Science, 76100 Rehovoth, Israel. Eli.Pollak@weizmann.ac.il

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 23, 2012
PubMed
Summary
This summary is machine-generated.

Measuring atom-surface scattering spectra reveals how surface corrugation strength affects temperature dependence. Stronger surface corrugations lead to a weaker temperature effect on scattering probabilities, offering insights into surface dynamics.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Atomic and molecular physics

Background:

  • Atom-surface scattering experiments provide insights into surface properties.
  • Understanding energy transfer mechanisms is crucial for surface dynamics.
  • Surface corrugation influences scattering behavior.

Purpose of the Study:

  • To establish a direct relationship between temperature dependence of scattering spectra and surface corrugation strength.
  • To develop theoretical expressions for scattering probabilities under classical conditions.
  • To investigate the impact of corrugation strength on temperature dependence.

Main Methods:

  • Utilizing classical perturbation theory.
  • Employing a Langevin bath formalism for energy transfer.
  • Deriving explicit expressions for scattering probabilities in 2D and 3D.
  • Obtaining analytic closed-form equations for strong corrugations.

Main Results:

  • A straightforward measure relates temperature dependence of scattering spectra to surface corrugation strength.
  • Explicit expressions for scattering probabilities were derived for 2D and 3D scattering.
  • For strong corrugations, temperature dependence of scattering probability weakens as corrugation strength increases.
  • The relationship to inelastic rainbow scattering was discussed.

Conclusions:

  • The study provides a method to quantify surface corrugation using temperature-dependent scattering spectra.
  • Theoretical models successfully describe energy transfer and scattering probabilities.
  • Surface corrugation significantly modulates the temperature effects on atom-surface interactions.