The study of host–guest chemistry in the gas phase has been pursued systematically only in the last 5 years, after sporadic interest in the 1980s, despite extensive investigation of this chemistry in the condensed phase and the success encountered in several Ðelds of application. Most gas-phase studies have been performed under the controlled conditions that can be achieved inside a mass spectr...

Inductively coupled plasma mass spectrometry (ICP-MS) is an analytical technique that performs elemental analysis with excellent sensitivity and high sample throughput. The ICP-MS instrument employs a plasma (ICP) as the ionization source and a mass spectrometer (MS) analyzer to detect the ions produced. It can simultaneously measure most elements in the periodic table and determine analyte con...

HR/AM analysis is a versatile method for residue analysis offering full quantitation capabilities in combination with unrestricted target and unknown screening options. Ultrahigh resolution delivered by the OrbitrapTM mass analyzer detection in the Exactive Plus mass spectrometer serves for reliability and selectivity comparable to established MS/MS techniques. Full UHPLC compatibility with unc...

A stu dy of the appearance potentia ls and isotope abundance of tbe rare gases has been made \yith a Consolidated Engin eering Corp. mass spectrometer as a check on the operation of th e instrument. The res ults a re comparable to previously publi shed data. In add ition, some nell' experimental value of ionization poten tials have been obtained. Generally, good agreement of the isotope ab unda...

Fast time-response of the Aerodyne Aerosol Mass Spectrometer (AMS) makes it a well-suited instrument for ambient field measurements. On the other hand, laboratory chamber experiments provide the opportunity to study a specific system in a more controlled environment. The goal of this thesis is to provide a summary of laboratory and field measurements using the AMS. During laboratory chamber pho...

trescine are major polyamines in mammalian cells, and they play important roles in cell growth and differentiation. Although a variety of analytical methods for polyamines have been developed, there is still a need for a simpler, more sensitive and accurate method. The mass spectrometric method can simultaneously separate and identify polyamines on the basis of the difference of their mass with...