By Douglas C. Neckers, David H. Volman, Günther von Bünau
Content material: Optical single-molecule detection at room temperature / Alfred J. Meixner -- Pressure-tuning photochemistry of steel complexes in answer / Rudi Van Eldik and Peter C. Ford -- Photo-induced and spontaneous proton tunneling in molecular solids / H. Peter Trommsdorff -- The EPR spectroscopic D parameter of localized triplet diradicals as explore for digital results in benzyl-type monoradicals / Waldemar Adam ... [et al.] -- Photothermal reviews of photophysical and photochemical procedures through the temporary grating process / Masahide Terazima
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Extra resources for Advances in Photochemistry
10 -9 s-l). 18 Chapter 1 9 What Is GC/MS? Unlike ei, ci usually produces even-electron protonated [M + H] + molecular ions. Usually, less fragmentation and more abundant molecular ions are produced with ci because less energy is transferred during ionization and because even-electron ions are inherently more stable than the oddelectron counterparts produced by ei. 1). This can be done, for example, by substituting isobutane for methane as the reagent gas to produce the weaker BrCnsted acid, t-C4H9 +.
Mass Spectrom. , 9, 115, 1990. This Page Intentionally Left Blank Part 11 GC Conditions, Derlvat~zat~on, and Mass Spectral Interpretation of Specific Compound Types I m m I m m m m I This Page Intentionally Left Blank ~ l ~ L~ / l l ~ l l t ~ . Chapter - 4 Acids I. GC Separations of Underivatized Carboxylic Acids A. Aliphatic Acids 1. Capillary columns a. C1-C5: C2-Clo+: 30 m D B - F F A P 30 m D B - F F A P 240 ~ at 10~ 100 p p m can be or H P - F F A P column at 135 ~ column (or equivalent), 5 0 run for 1 hr (approximately detected).
25 26 Chapter 2 9 Interpretation of Mass Spectra An abundant molecular ion may indicate that an aromatic compound or highly unsaturated ring compound is present. If no molecular ion is observed and one cannot be deduced, the use of chemical ionization (ci), negative chemical ionization (nci), fast atom bombardment (FAB), or electrospray ionization (ESI) should provide a molecular ion. Preparation of Trimethylsilyl Derivative Another way to establish the molecular weight is by preparing derivatives of hydroxyl, amino, or carboxylic acid groups.