منابع مشابه
Non-equilibrium Photodissociation Regions: Ionization-dissociation Fronts
We discuss the theory of coupled ionization{dissociation fronts produced when molecular clouds are exposed to < 1110 A radiation from hot stars. A steady, composite structure is developed, which generally includes an ionized outtow away from the cloud, an ionization front, a layer of photodissociated gas, a photodissociation front, and a shock wave preceding the photodissociation front. We show...
متن کامل2 Principles of Ionization and Ion Dissociation
The mass spectrometer can be regarded as a kind of chemical laboratory, especially designed to study ions in the gas phase [1,2]. In addition to the task it is commonly used for – creation of mass spectra for a generally analytical purpose – it allows for the examination of fragmentation pathways of selected ions, for the study of ion–neutral reactions and more. Understanding these fundamentals...
متن کاملControl of ionization and dissociation by optical pulse trains.
Ever since the first lasers were built over 40 years ago, chemists and physicists have been attempting to exploit them as tools for controlling the outcome of chemical reactions. Over the last decade this dream has become a reality. The most successful approaches have employed learning algorithms to shape femtosecond laser pulses; however, in these experiments, the laser light effectively learn...
متن کاملIonization and dissociation of CH3I in intense laser field.
The ionization-dissociation of methyl iodide in intense laser field has been studied using a reflection time-of-flight mass spectrometry (RTOF-MS), at a laser intensity of < or =6.6x10(14) W/cm(2), lambda=798 nm, and a pulse width of 180 fs. With the high resolution of RTOF-MS, the fragment ions with the same M/z but from different dissociation channels are resolved in the mass spectra, and the...
متن کاملIonization and dissociation equilibrium in strongly-magnetized helium atmosphere
Recent observations and theoretical investigations of neutron stars indicate that their atmospheres consist not of hydrogen or iron but possibly heavier elements such as helium. We calculate the ionization and dissociation equilibrium of helium in the conditions found in the atmospheres of magnetized neutron stars. For the first time this investigation includes the internal degrees of freedom o...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1998
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed075p1089.2