Chemical ionization (CI) is a soft ionization technique used in mass spectrometry. [ 1 ] [ 2 ] This was first introduced by Burnaby Munson and Frank H. Field in 1966. [ 3 ] This technique is a …

Chemical Ionization (CI) is a soft ionization technique that produces ions with little excess energy. As a result, less fragmentation is observed in the mass spectrum. Since this increases the …

2023年2月11日 · In chemical ionization, the sample is introduced to a chamber filled with excess reagent gas (such as methane). The reagent gas is ionized by electrons, forming a plasma …

Chemical Ionization (CI) Involves ionization of a gas molecule (CH 4) to protonate the analyte (at pressures of 1 Torr) Ionizing gas usually present at concentrations 10 3-10 4 times the analyte …

Chemical Ionization (CI) is an ionization technique by which high-energy electrons initially ionize reagent gases, such as methane (CH4) or ammonia (NH3) before these ions react with the …

2022年2月28日 · Chemical ionization (symbol: CI) is a mass-spectroscopic technique, used when the peak with the highest mass-to-charge ratio in a mass spectrum is suspected not to be the …

2023年7月7日 · Chemical ionization is the technique of ionization in which the vaporized sample is inserted into the mass spectrometer accompanied by an excess of reagent gas at around 1 …

Chemical Ionization (CI) Introduced in 1966 by Munson and Field1, it was a direct outgrowth of fundamental studies of ion/molecule interactions. Where other techniques rely on interaction of …

Chemical ionization is a lower-energy alternative to EI for the analysis of volatile molecules. CI provides simple mass spectra with reduced fragmentation compared to EI. One advantage is …

Chemi-ionization is the formation of an ion through the reaction of a gas phase atom or molecule with another atom or molecule when the collision energy is below the energy required to ionize …

Chemical ionization uses a reagent gas to ionize sample molecules through ion–molecule reactions in the gas phase. The reagent gas (e.g., methane) first undergoes electron …

2017年6月14日 · The term chemical ionization (CI) usually applies to all ionization processes that proceed via ion–molecule reactions. In CI, analyte molecules, M, are ionized by reacting with …

2023年9月17日 · Chemical ionization is a softer ionization technique in mass spectrometry, where sample molecules react with reagent ions, often through protonation, to form ionized molecular …

Chemical ionization (CI) is a soft ionization technique, which is the direct application of the research results of molecular and ion reactions in analytical chemistry. The earliest ionization …

Chemical Ionization (CI) is a "soft" ionization technique that produces ions with little excess energy. As a result, less fragmentation is observed in the mass spectrum. Since this increases …

Chemical ionization, CI, is another ionization technique used widely in GC–MS applications. CI relies on a reagent gas to assist in the ionization process of the compounds of interest. Typical …

Chemical ionization (CI) is an ionization technique used in mass spectrometry. With chemical ionization, the ions produced have little excess energy which results in less fragmentation than …

Ionization, in chemistry and physics, any process by which electrically neutral atoms or molecules are converted to electrically charged atoms or molecules (ions) through gaining or losing …

Chemical Ionization. Chemical ionization is a soft ionization method based on ion-molecule reactions occurring in an electron impact ionizer. As shown in Figure \(\PageIndex{3}\) reagent …

Ionization (or ionisation specifically in Britain, Ireland, South Africa, Australia and New Zealand) is the process by which an atom or a molecule acquires a negative or positive charge by gaining …

2015年11月11日 · Chemical ionization is a softer ionization technique than electron ionization, which causes less fragmentation and makes it easier to detect molecular ions. The document …

2025年1月12日 · The common ion effect suppresses the ionization of a weak acid by adding more of an ion that is a product of this equilibrium. Adding a common ion to a system at equilibrium …