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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...
Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

The Arrhenius equation,
Absorption of Radiation01:05

Absorption of Radiation

The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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...
Le Chatelier's Principle: Changing Temperature02:19

Le Chatelier's Principle: Changing Temperature

Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...

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Related Experiment Video

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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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[Temperature effect correction for Chang'E-3 alpha particle X-ray spectrometer].

Ming-Ye Wu1, Huan-Yu Wang, Wen-Xi Peng

  • 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China. wumy@ihep.ac.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 29, 2012
PubMed
Summary
This summary is machine-generated.

This study addresses temperature variations affecting the Alpha Particle X-ray Spectrometer (APXS) on the lunar surface. A new correction method using Pearson

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Area of Science:

  • Planetary science and instrumentation
  • Lunar exploration technology
  • Spectroscopy and sensor calibration

Context:

  • The Chang'E-3 lunar rover utilizes an Alpha Particle X-ray Spectrometer (APXS) for surface analysis.
  • Environmental temperature fluctuations on the Moon impact APXS sensor performance.
  • Varying sensor temperatures degrade the energy resolution of spectral data.

Purpose:

  • To introduce the APXS payload and its operational environment on the lunar surface.
  • To investigate the effects of environmental temperature on APXS sensor performance.
  • To present and validate a novel correction method for improving APXS energy resolution under temperature variations.

Summary:

  • The paper details the APXS components, functionality, and lunar surface working conditions.
  • Simulations and experiments confirm that APXS sensor temperature varies, worsening energy resolution.
  • A correction method based on Pearson's chi-squared test is proposed and tested, demonstrating improved energy resolution.

Impact:

  • The developed correction method enhances the reliability and accuracy of APXS data.
  • This technique is crucial for precise elemental analysis of lunar regolith and rocks.
  • Improves the scientific return from lunar missions utilizing similar spectroscopic instruments.