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Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview01:19

Inductively 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...
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.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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.
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Blood plasma is a fluid that contains approximately 92% water and 8% solutes. The solutes include various types of proteins, which constitute about 7% of the total solutes in the plasma. The high-molecular-weight proteins—albumins, globulins, and fibrinogen—are essential to plasma function. Albumins, making up about 60% of the plasma proteins, maintain the osmotic balance within blood vessels by preventing excessive water leakage. Additionally, albumins serve as carrier proteins, binding to...
Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
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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El cometa Giacobini-Zinner: Descripción del plasma de su cometa.

S J Bame, R C Anderson, J R Asbridge

    Science (New York, N.Y.)
    |April 18, 1986
    PubMed
    Resumen

    La nave espacial ICE observó fuertes interacciones del viento solar con el cometa Giacobini-Zinner. No se detectó ningún choque de proa, pero se identificó una región de transición, una vaina y una cola de plasma, revelando complejas dinámicas de plasma cometario.

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    Área de la Ciencia:

    • * * Física del espacio Física del espacio
    • * Ciencia de los cometas.
    • * Física del Plasma es la Física del Plasma.

    Sus antecedentes:

    • * Comprender las interacciones entre el viento solar y los cometas es crucial para la ciencia planetaria.
    • * El cometa Giacobini-Zinner proporcionó un laboratorio natural único para estudiar estos fenómenos.

    Objetivo del estudio:

    • * Para analizar los datos de electrones de plasma de la nave espacial ICE durante su encuentro con el cometa Giacobini-Zinner.
    • * Para investigar la estructura y la dinámica de la interacción del cometa con el viento solar.
    • * Para identificar fenómenos aguas arriba y caracterizar el entorno de plasma cometario.

    Principales métodos:

    • * Mediciones in situ utilizando el experimento de electrones de plasma de Los Álamos en la nave espacial ICE.
    • * Observación del flujo de calor de los electrones y las fluctuaciones de densidad.
    • * Análisis del calentamiento, compresión y desaceleración del plasma en la región de interacción.

    Principales resultados:

    • * Se observó una fuerte interacción del viento solar con el cometa Giacobini-Zinner, incluido el calentamiento de electrones y las fluctuaciones de densidad.
    • * No se detectó ningún choque de arco convencional; en su lugar, se identificó una región de transición y una vaina.
    • * Se observó un coma intermedio frío y una cola de plasma de alta densidad, análoga a la cola magnética de la Tierra.

    Conclusiones:

    • * La interacción del viento solar con el cometa Giacobini-Zinner crea un entorno de plasma complejo sin un choque de arco distinto.
    • * La captación de iones cometarios y el drapeado del campo magnético interplanetario probablemente contribuyen a las estructuras plasmáticas observadas.
    • * Los hallazgos proporcionan información sobre la formación de colas de plasma y configuraciones similares a las de las colas magnéticas en entornos cometarios.