A very simple way to measure coaxial cable impedance (2007)
Fonseca,P., Santos,A.C.F., Montenegro,E.C.
A very simple experiment is described to measure the impedance of a coaxial cable and the velocity of propagation of a pulse. The experiment uses a fast pulse, which has the advantage of avoiding...
Projectile electron loss in nitrogen (2006)
Santos,A. C. F., Melo,W. S., Sant'Anna,M. M., Sigaud,G. M., Montenegro,E. C.
The projectile electron loss channel plays an important role in modeling several processes connected to the penetration of swift ions in gases, such as radiation damage, energy loss, upper atmosphere...
Primary Radicals Production fromWater Fragmentation by Heavy Ions (2006)
Primary Radicals Production fromWater Fragmentation by Heavy Ions
Primary radicals production from water fragmentation by heavy ions (2005)
The importance of fragmentation of water molecules by heavy ions is discussed for several different physical environments, including tumor treatment, planetary sciences and fission reactors. The...
Direct evidence of a strong isomer effect in electron-impact double ionization of C3H4 (2005)
Scully, S. W. J., Senthil, V., Wyer, J. A., Shah, M. B., Montenegro, E. C., Kimura, M., ...
The electron-impact double ionization of two isomers of C3H4 (allene and propyne) between 25 and 1000 eV has been investigated using time-of-flight mass spectrometry. Unambiguous differences in the...
Multiple ionization of noble gases by swift H2+ ions in breakup and nonbreakup collisions (2004)
Sigaud, G. M., Sant'Anna, M. M., Luna, H., Santos, A. C. F., McGrath, C., Shah, M. B., ...
We have measured multiple-ionization yields of He , Ne , Ar , Kr , and Xe targets by 1.0 MeV∕amu H2+ molecular ions for both the dissociative and nondissociative channels. Except for the case of...
Multiple Ionization of Ne by H2+ Ions with Correlated Projectile Electron Loss (2004)
Sant'Anna, M M, Luna, H, Santos, A C F, McGrath, C, Shah, M B, Cavalcanti, Eric Gama, ...
We consider multiple ionization of Ne by fast H2+, with and without projectile electron loss. Measurements of the total cross section for the direct ionization channel support the similarity of...
Multiple ionization of noble gases by swift H2+ ions in breakup and nonbreakup collisions (2004)
Sigaud, G. M., Sant'Anna, M. M., Luna, H., Santos, A. C. F., McGrath, C., Shah, M. B., ...
We have measured multiple-ionization yields of He , Ne , Ar , Kr , and Xe targets by 1.0 MeV∕amu H2+ molecular ions for both the dissociative and nondissociative channels. Except for the case of...
Multiple Ionization of Ne by H2+ Ions with Correlated Projectile Electron Loss (2004)
Sant'Anna, M M, Luna, H, Santos, A C F, McGrath, C, Shah, M B, Cavalcanti, Eric Gama, ...
We consider multiple ionization of Ne by fast H2+, with and without projectile electron loss. Measurements of the total cross section for the direct ionization channel support the similarity of...
Two-center electron-electron correlation within the independent event model (2003)
Sigaud,G. M., Montenegro,E. C.
The Independent Event Model (IEVM) is used to analyze collision processes for systems with three and four electrons, in situations where up to three active electrons are involved and dynamical...
Postcollisional decay in Ne multiple ionization by H2+ ions in breakup collisions (2003)
Sant'Anna, M. M., Luna, H., Santos, A. C. F., McGrath, C., Shah, M. B., Cavalcanti, Eric Gama, ...
We measured the Neq+ charge-state yield distribution for Ne atoms multiply ionized by 1-MeV/amu H2+, in coincidence with the final state of the projectile, for both breakup and nonbreakup channels....
Postcollisional decay in Ne multiple ionization by H2+ ions in breakup collisions (2003)
Sant'Anna, M. M., Luna, H., Santos, A. C. F., McGrath, C., Shah, M. B., Cavalcanti, Eric Gama, ...
We measured the Neq+ charge-state yield distribution for Ne atoms multiply ionized by 1-MeV/amu H2+, in coincidence with the final state of the projectile, for both breakup and nonbreakup channels....
CH4 ionization and dissociation by proton and electron impact (2003)
Luna, H, Cavalcanti, Eric Gama, Nickles, J, Sigaud, G M, Montenegro, E C
Absolute dissociative and non-dissociative ionization cross sections of CHn+ (n = 0–4) molecules by protons in the 0.5–3.5 MeV impact energy range have been measured. The present results are in...
Absolute cross sections for multiple ionization of noble gases by swift proton impact (2003)
Cavalcanti, Eric Gama, Sigaud, G M, Montenegro, E C, Schmidt-Böcking, H
Absolute cross sections, σq+, for multiple ionization of He (q = 1), Ne (q = 1, 2, and 3), Ar (q = 1, 2, 3, and 4), Kr (q = 1, 2, 3, and 4), and Xe (q = 1, 2, 3, 4, and 5) atoms by protons in the...
CH4 ionization and dissociation by proton and electron impact (2003)
Luna, H, Cavalcanti, Eric Gama, Nickles, J, Sigaud, G M, Montenegro, E C
Absolute dissociative and non-dissociative ionization cross sections of CHn+ (n = 0–4) molecules by protons in the 0.5–3.5 MeV impact energy range have been measured. The present results are in...
Absolute cross sections for multiple ionization of noble gases by swift proton impact (2003)
Cavalcanti, Eric Gama, Sigaud, G M, Montenegro, E C, Schmidt-Böcking, H
Absolute cross sections, σq+, for multiple ionization of He (q = 1), Ne (q = 1, 2, and 3), Ar (q = 1, 2, 3, and 4), Kr (q = 1, 2, 3, and 4), and Xe (q = 1, 2, 3, 4, and 5) atoms by protons in the...
Danzmann, Karsten, Meyerhof, W. E., Belkacem, A., Montenegro, E. C., Dillard, E., Hülskötter, H. P., ...
We have searched for three-photon decays produced in 6-MeV/nucleon U+Th, Th+Th, and U+U collisions. We see no evidence for narrow lines corresponding to the electron-positron lines seen by others: in...
Correlated two-photon lines from 6-MeV/nucleon U+Th, U+U, and Th+Th collisions (1989)
Danzmann, Karsten, Meyerhof, W. E., Montenegro, E. C., Dillard, E., Hülskötter, H. P., Guardala, N., ...
We find that narrow lines at 1043 and 1062 keV in the summed-energy, 180°-correlated two-photon spectrum from ≊6-MeV/nucleon U+Th collisions can be produced by cascades from high-spin states (32+)...
Xu, Xiang-Yuan, Montenegro, E. C., Anholt, R., Danzmann, Karsten, Meyerhof, W. E., Schlachter, A. S., ...
Projectile K-shell ionization and excitation cross sections were measured for 8.6-MeV/amu Ca19+,18+ beams incident on various gas targets. The ionization and excitation cross sections are compared...
Intermediate-velocity atomic collisions. III. Electron capture in 8.6- MeV/amu Ca ions (1988)
Montenegro, E. C., Xu, Xiang-Yuan, Meyerhof, W. E., Anholt, R., Danzmann, Karsten, Schlachter, A. S., ...
Electron-capture cross sections by 8.6-MeV/amu Ca18+, Ca19+, and Ca20+ beams were measured in gas targets from H2 to Xe. Measurements were made of total electron capture as well as of electron...
180°-correlated equal-energy photons from 5.9-MeV/nucleon U + Th collisions (1987)
Danzmann, Karsten, Meyerhof, W. E., Montenegro, E. C., Xu, Xiang-Yuan, Dillard, E., Hülskötter, H. P., ...
We have found a narrow line (intrinsic width ≤2.5 keV) at 1062±1 keV in the summed-energy 180°-c.m.-correlated two-photon spectrum from 5.95-MeV/nucleon U+Th collisions. Including possible...