Video Experimental Relacionado
Updated: Jul 16, 2026
06:46
Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
Published on: August 25, 2016
Sublimación de chorros helados como una sonda del contenido volátil interestelar de los cometas
G A Blake1, C Qi, M R Hogerheijde
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91125, USA. gab@gps.caltech.edu
Nature
|March 27, 1999
Resumen
El cometa Hale-Bopp fue descubierto.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Ciencias planetarias Ciencias planetarias.
- La astroquímica es astroquímica.
Sus antecedentes:
- Los cometas ofrecen información sobre el sistema solar temprano y la transformación de las nubes moleculares en sistemas planetarios.
- Estudios anteriores promediaron la composición volátil en grandes áreas, mezclando procesos químicos nucleares y cometarios.
Objetivo del estudio:
- Para investigar la composición de los volátiles en el cometa Hale-Bopp en alta resolución.
- Para determinar el origen de los materiales cometarios mediante el análisis de las relaciones de abundancia molecular.
Principales métodos:
- Observaciones de alta resolución de la emisión de las moléculas HNC, DCN y HDO en el cometa Hale-Bopp.
- Análisis de las relaciones de abundancia molecular en escalas pequeñas (1-3 segundos de arco).
Principales resultados:
- Identificó estructuras en forma de arco ( chorros de hielo) cerca del núcleo.
- Las proporciones de abundancia molecular observadas en escalas pequeñas difieren significativamente de las escalas más grandes.
- Estas proporciones coinciden con las que se encuentran en las nubes interestelares y los objetos estelares jóvenes.
Conclusiones:
- La sublimación de los granos de hielo expulsados del núcleo proporciona acceso a los volátiles inalterados.
- El cometa Hale-Bopp contiene una fracción sustancial (15-40% en masa) de material interestelar sin procesar.
- Sugiere que la nebulosa solar temprana incorporó cantidades significativas de materia interestelar prístina.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:21Chemical Ionization (CI) Mass Spectrometry
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
01:12Electrospray Ionization (ESI) Mass Spectrometry
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
01:19Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then passed on to...
01:22Atomic 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.
01:19Inductively 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.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.