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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 Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle

Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Sputtering and heating of Titan's upper atmosphere.

Robert E Johnson1

  • 1University of Virginia, Charlottesville, VA 22904, USA Department of Physics, New York University, New York, NY 10003, USA. rej@virginia.edu

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|December 17, 2008
PubMed
Summary

Titan

Area of Science:

  • Planetary Science
  • Atmospheric Science
  • Astrochemistry

Background:

  • Titan's atmospheric evolution is crucial for understanding planetary atmospheres.
  • Previous models suggested low escape rates for heavy species on Titan.
  • Cassini mission data revealed significantly higher heavy species loss rates.

Purpose of the Study:

  • To review and compare recent estimates of neutral escape rates from Titan's atmosphere.
  • To emphasize the role of plasma-induced sputtering and heating in atmospheric loss.
  • To assess the consistency of proposed loss rates with magnetospheric plasma composition.

Main Methods:

  • Analysis of Cassini Ion and Neutral Mass Spectrometer and Huygens Atmospheric Structure Instrument data.
  • Utilizing three distinct one-dimensional models to estimate heavy-molecule loss rates.

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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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  • Employing fluid dynamic, diffusion, and coronal structure models to simulate atmospheric escape.

    • Main Results:

    • Substantially larger estimates for heavy species loss rates (0.3-5x10^28 amu s^-1) were derived from Cassini data.
    • Hydrogen escape is clearly indicated by H2 density.
    • Proposed escape mechanisms include plasma-induced sputtering, heating, and 'slow hydrodynamic' escape.

    Conclusions:

    • The largest suggested heavy species loss rates may be inconsistent with observed magnetospheric plasma composition.
    • Estimated upward flow could be explained by alternative atmospheric loss mechanisms or transport.
    • Understanding Titan's atmospheric escape is critical for comprehending its evolution.