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3 edition of Dissociative and double photoionization cross sections of NO from threshold to 120 A found in the catalog.

Dissociative and double photoionization cross sections of NO from threshold to 120 A

Dissociative and double photoionization cross sections of NO from threshold to 120 A

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English


Edition Notes

StatementJames A.R. Samson, T. Masuoka, and P.N. Pareek
SeriesNASA contractor report -- NASA CR-176185
ContributionsMasuoka, T, Pareek, P. N, United States. National Aeronautics and Space Administration
The Physical Object
FormatMicroform
Pagination1 v
ID Numbers
Open LibraryOL14985932M

Photoionization and total absorption cross sections have been measured for CO 2, CO, Ar, and He at the wavelengths in the region A to A which correspond to intense solar emission wavelength resolution, determined from the measured width of each of the spectral lines generated within the light sources, was in the range to A. ion produced in the electron impact dissociative ioniza- tion of N, has been the subject few previous investigations. This can probably be attributed to the low cross section for its production. We have recently estimated this cross section to have a maximum value of x l8 cm2 (Crowe and McConkey a).

§1. INTRODUCTION The photoionization cross sections of H, H 2, and He are important parameters in the determination of the ionization structure of cosmic gas subjected to ultraviolet and X-ray cross section for H is known analytically as a function of photon energy (Bethe & Salpeter ; Sobel'man ), but the values for He and H 2 are approximate. The dissociative photoionization of CF 3 Cl was investigated using threshold photoelectron photoion coincidence (TPEPICO) imaging in the energy range of – eV. The coincident time-of-flight mass spectra and three-dimensional time-sliced images of the CF 2 Cl + fragment were recorded at a few specific photon energies. Two fragmentation pathways were observed that led to the breakage.

The measured photoionization cross section for the ground state of O,+ shown in Fig. 5 is more ~mplica~ than any of the other measured partial cross sections for N, and Oa. It has been necessary to use the sum of two cross sections of the form of equation (1) to fit the O,+ ground state. Because of this the threshold wavelength.   Besides determining the thresholds for different fragmentation processes they obtained the absolute DPI cross section as well as the ratio of the double- to single-photoionization cross sections, which is shown in figure The ratio exhibits a maximum at about 12 eV above threshold whose origin is unknown.


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Dissociative and double photoionization cross sections of NO from threshold to 120 A Download PDF EPUB FB2

Dissociative and double photoionization cross sections of NO from threshold to Å J. Chem. Phys. 83, (); James A. Samson, T. Masuoka, and P. N Cited by: Get this from a library. Dissociative and double photoionization cross sections of NO from threshold to A. [James A R Samson; T Masuoka; P N Pareek; United States.

National Aeronautics and Space Administration.]. DISSOCIATIVE AND DOUBLE PHOTOIONIZATION CROSS SECTIONS 0 OF NO FROM THRESHOLD TO A James A.R. Samson, T. Masuokaa), and P.N. Pareekb) Behlen Laboratory of Physics, Lincoln, NE.

(NASA-CR) DISSOCIATIVE AND DOUBLE NBS PHOTOIONIZATION CROSS SECTIONS OF NO FROM THRESHOLD TO A (Nebraska Univ.). The photoionization cross sections for producing the O 2 + parent ion and the O + fragment ion from neutral O 2 are presented from to Å. A new technique was used that eliminated the serious problem of identifying the true abundance of the O + ions.

These ions are generally formed with considerable kinetic energy and because most mass spectrometers discriminate against energetic Cited by: Partial cross sections for molecular photoionization (CO +), dissociative photoionization (C + and O +), and dissociative double photoionization (C 2+) in CO have been measured from their thresholds to 90 Å using techniques of mass spectrometry.

The results are compared with data reported previously. Several peaks observed in the cross section curves for dissociated fragments are tentatively Cited by: We present absolute partial electron impact ionization cross sections for propene in the electron energy range between threshold and eV measured with a two sector field double focussing mass.

Absolute cross sections and thresholds for cation pair production from the fragmentation of CF4 are reported for electron impact energies from threshold to eV, with the ion pair cross sections. threshold photoelectron spectrum up to the dissociation threshold, and Franck−Condon simulations identify the O C O bend mode, in particular in combination with the C O stretch mode, to be active.

The DMC ionization energy was determined to be ± eV. The first dissociative photoionization product, CH 2 OH +, dominates the breakdown. The photoionization cross sections for double ionization of Ne by single photons have been measured from threshold to eV.

The results presented are in considerable variance with other. the total photoionization cross-sections and the partial photo-ionization cross-sections for dissociative ionization.

Decades of research have established photoionization cross-sections for many stable polyatomic molecules,2 but characterizing the electron impact3,4 or photoionization (using a method analo.

Their total photoionization cross-sections rise gradually from threshold in a quasi-linear fashion, with major contributions from numerous dissociative ionization channels. The parent ion cross-sections rise to plateaus at photon energies coincident with the onset of dissociative photoionization (typically ≲ – eV above threshold.

Photoionization cross sections for the production of the doubly charged ion N2+ from N2 have been measured by means of synchrotron radiation in the photon energy range from 50toeV. The appearance energy for N2+ has been determined as ±eV, i.e., about eV higher than the spectroscopic dissociation limit leading to the charge asymmetric dissociation channel N2+(P2)+N(S4).

The partial cross-sections for single and double photoionization depicted in Fig. 3 are derived using partial cross-sections for single photoionization (σ +) shows a sharp decrease with increasing photon energy below 28 eV, then shows slow decrease from 30 to 40 eV, and decreases monotonously until the photon energy reaches up to the contrary, the partial cross-section.

The cross section for capture to level n is e- H+ + e H + h Radiative recombination is the inverse of photoionization. Milne calculated the cross section from Kramer’s cross section using detailed balance (Spitzer Eq.Rybicki & Lightman Sec) It depends on electron speed as w The rate-coefficient, n.

The present partial photoionization cross-sections were obtained by the use of Eq. using the total absorption cross-section reported by Au and results are shown in Fig. 2 in comparison with those of Au and Brion, with the numerical values in Table should be noted that Au and Brion used the ionization yield of unity above eV (even in the energy region that dissociative.

Photoionization cross sections for the production of the doubly charged ion N2+ from N2 have been measured by means of synchrotron radiation in the photon energy range from 50 to eV.

The appearance energy for N2+ has been determined as +/ eV, i.e., about eV higher than the spectroscopic dissociation limit leading to the charge. We report the determination of the absolute photoionization cross section of cyclopropenylidene, c-C 3 H 2, and the heat of formation of the C 3 H radical and ion derived by the dissociative ionization of the carbene.

Vacuum ultraviolet (VUV) synchrotron radiation as provided by the Swiss Light Source and imaging photoelectron photoion coincidence (iPEPICO) were employed. The relative photoionization cross section of atomic nitrogen for the production of singly and doubly charged ions has been measured from to A and from to A.

The results have been made absolute by normalization to one-half of the molecular nitrogen cross section at short wavelengths. Also, dissociative photoionization cross sections were measured for the production of CH4(+), CH3(+), CH2(+), CH(+), and C(+) from their respective thresholds to A, and for H(+) and H2.

4 Advances in Physical Chemistry 0 W(eV) 1 10 Double di ff erential cross sections E=eV θ=30 Total SiH3 SiH2 SiH+(×2) Si+ H+ H2 (a) 0 W(eV) 1 10 Double di.

The cross section for the formation of metastable CS 2 2+ by photoionization has been reported from the threshold up to 50 eV. In addition to CS 2 2+, Lablanquie et al.

studied dissociative double photoionization and reported the cross sections as well as the thresholds for three dissociation channels, S + +CS +, S + +C+S +, and S + +C + +S.respectively, and the photoionization cross sections ρ0>r1 is given by 4 0 1 2 σ=2πρ0 (r /r).

(11) The cross sections of He atom and all He-like ions FIG. 1. Photoionization cross sections of H atom and H-like ions as function of photon radius.

The solid curves are .From the adiabatic ionization potential (AIP: H 2, ; O 2, ; NO, ) of diatomic molecules to the dissociative ionization threshold, the absolute partial cross-section is nearly the same as the absolute total ionization cross-section in the dissociative photoionization cross-sections.

The decay mechanism of various absorption.