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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.
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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...
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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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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...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Iones en Fase Gaseosa a partir de Microgotas Neutras

Ochir Ochirov1, Pawel L Urban1

  • 1Department of Chemistry, National Tsing Hua University, 101, Section 2, Kuang-Fu Rd., Hsinchu, 300044, Taiwan.

ACS central science
|January 1, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Las gotas de agua neutras pueden cargarse mediante electrificación por contacto y fragmentación mecánica. Este proceso crea una vía para la formación de iones en fase gaseosa a partir de agua neutra.

Palabras clave:
electrificación por contactofragmentación de gotasiones en fase gaseosagotas de aguaciencias atmosféricasaerosoles

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Área de la Ciencia:

  • Química atmosférica
  • Fisicoquímica
  • Ciencia de aerosoles

Sus antecedentes:

  • La formación de iones en fase gaseosa es crucial para los procesos atmosféricos.
  • La comprensión de los mecanismos de formación de iones en el agua es esencial para diversos campos científicos.
  • Investigaciones anteriores han explorado varios métodos para generar iones.

Objetivo del estudio:

  • Investigar el papel de la electrificación por contacto y la fragmentación mecánica en la carga de gotas de agua neutras.
  • Establecer una vía para la formación de iones en fase gaseosa a partir de agua neutra.
  • Proporcionar información sobre los procesos fundamentales que rigen la carga de gotas de agua.

Principales métodos:

  • Utilización de experimentos controlados de laboratorio para simular la electrificación por contacto.
  • Empleo de técnicas de fragmentación mecánica para fragmentar gotas de agua.
  • Análisis de la distribución de carga y la formación de iones resultantes de estos procesos.

Principales resultados:

  • Se demostró que la electrificación por contacto carga eficazmente las gotas de agua neutras.
  • Se mostró que la fragmentación mecánica de gotas cargadas conduce a una mayor generación de iones.
  • Se identificó una correlación directa entre la fragmentación de gotas y el rendimiento de iones en fase gaseosa.

Conclusiones:

  • La electrificación por contacto y la fragmentación mecánica son mecanismos viables para cargar gotas de agua neutras.
  • Estos procesos ofrecen una vía para generar iones en fase gaseosa a partir de agua.
  • Los hallazgos tienen implicaciones para la ciencia atmosférica y la investigación de aerosoles.