A general description of K X-ray de-excitation of titanium

Moore, C. F.; Senglaub, M.; Johnson, B. M.; Richard, Patrick

doi:10.1016/0375-9601(72)90816-x

Cited by 38 publications

(4 citation statements)

References 7 publications

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“…The natural widths of the K-α lines of elements with Z ∼ 20 are ≤2 eV (Krause & Oliver 1979). The energy shift of the line position depends on the projectile type and its kinetic energy (Moore et al 1972;Kauffman et al 1973;Verma 2000), and has a maximum value of ∼80 eV for Ti (Moore et al 1972;Verma 2000). But an energy shift of the detected line cannot be unambigously claimed from the data.…”

Section: Charge States Of the Abundant Ions In The Outer Rimmentioning

confidence: 95%

“…of inner-shell ionization of the abundant constituents of the SNR rim induced by electron capture decay; or (2) -the line is a consequence of collisions of ions present in the SNR outer shell with the ambient matter, predominantly with the ISM hydrogen atoms or electrons. In the latter case the width and the shift of the line are carrying information about the expansion velocity of the SNR (Moore et al 1972;Kauffman et al 1973;Garcia et al 1973;Verma 2000;Iyudin & Aschenbach 2001). Most likely the line at ∼4.4 keV is a blend of lines emitted by 44 Sc after 44 Ti decay.…”

Section: Charge States Of the Abundant Ions In The Outer Rimmentioning

confidence: 99%

“…In this case ions contained in the outermost layers of the ejecta will have kinetic energies of ∼1 MeV/amu, and therefore will experience internal ionisation of the K-shell through collisions with the heavy atoms (ions) of the ambient matter, possibly contained in clouds. As a result of such an interaction also the emitted K-α and K-β lines of Sc and Ti could be broadened and shifted to higher energies because of the contribution of satellite lines created in these heavy ion-atom collisions (Moore et al 1972;Kaufmann et al 1973;Whalen & Briancon 1975). But such an interpretation seems to be in conflict with measured position, shape and energy spread of the X-ray lines.…”

Section: Charge States Of the Abundant Ions In The Outer Rimmentioning

confidence: 99%

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XMM-Newtonobservations of the supernova remnant RX J0852.0-4622/GRO J0852-4642

Iyudin¹,

Aschenbach²,

Becker³

et al. 2004

A&A

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Abstract. RX J0852.0-4622 is a supernova remnant discovered in the ROSAT all-sky survey. Spatially coincident 1.157 MeV γ-ray line emission was detected with the COMPTEL instrument on-board CGRO. The analysis combining the X-ray and γ-ray data suggests that RX J0852.0-4622 is a close-by and young supernova remnant. Follow-up observations with ASCA show that the two brightest sections of the limb have non-thermal spectra, which make an independent assessment of the age and distance using the Sedov equations for the evolution of the remnant almost impossible. We have observed three rim sections of RX J0852.0-4622 with XMM-Newton and confirm the power-law type spectra measured with ASCA. We also confirm the presence of an emission-line like feature at 4.45 ± 0.05 keV, which we suggest to be emission from Ti and Sc excited by atom/ion or ion/ion high velocity collisions. The high velocity is in agreement with the width of the 1.157 MeV γ-ray line. The X-ray line flux expected from such an interaction is consistent with the 1.157 MeV γ-ray line flux measured by COMPTEL. This consistency of the X-ray line flux and the γ-ray line flux lends further support to the existence and amounts of Ti in RX J0852.0-4622 claimed by Iyudin et al. (1998, Nature, 396, 142) and to the suggestion that RX J0852.0-4622 is young and nearby (Aschenbach et al. 1999, A&A, 350, 997). Iyudin et al. (1998) quote a very large broadening of the 1.157 MeV γ-ray line which would indicate a large velocity of the emitting matter of about 15 000 km s −1 . Such high ejecta velocity for Ti is found only in explosion models of sub-Chandrasekhar type Ia supernovae (Woosley & Weaver 1994, ApJ, 423, 371; Livne & Arnett 1995, ApJ, 452, 62). In this case no compact remnant is expected. The obvious, remaining questions are what the nature and the origin of the central compact source CXOU J085201.4-461753 are and why the absorption column density apparently associated with RX J0852.0-4622 is much greater than the typical column for the Vela SNR.

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Section: Charge States Of the Abundant Ions In The Outer Rimmentioning

confidence: 95%

Section: Charge States Of the Abundant Ions In The Outer Rimmentioning

confidence: 99%

Section: Charge States Of the Abundant Ions In The Outer Rimmentioning

confidence: 99%

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XMM-Newtonobservations of the supernova remnant RX J0852.0-4622/GRO J0852-4642

Iyudin¹,

Aschenbach²,

Becker³

et al. 2004

A&A

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“…Experimental and theoretical studies of ion-induced inner-shell ionization through K x-ray multiple ionization satellites [5] started about four decades ago when MeV energy electrostatic accelerators were extensively employed for fundamental atomic physics studies. Numerous experimental studies were performed, predominantly on KL ionization, directed towards understanding of the multiple ionization induced in ion atom collisions [6][7][8][9][10][11][12]. The validity of the independent-electron approximation for the description of multiple inner-shell ionization was discussed in these works.…”

Section: Introductionmentioning

confidence: 99%

M shell ionization of Ar induced in near-central collisions with MeV protons

Kavčič

Banaś

2016

J. Phys. B: At. Mol. Opt. Phys.

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High energy resolution x-ray emission spectra of Ar induced in collisions with 0.75–3.0 MeV protons were measured using a complete in-vacuum curved-crystal x-ray emission spectrometer in Johansson geometry. The satellite lines were clearly resolved in the measured spectra and their intensity relative to the parent diagram line was used to extract the M shell single ionization probability for near-central collisions. The experimental values are compared to the theoretical predictions calculated within the semiclassical approximation (SCA) and also the binary encounter based geometrical model. Very good agreement with experimental data was achieved for the SCA values employing concise Dirac–Hartree–Fock wave functions for the description of valence M shell electrons.

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Ion-Atom Collisions - High Energy

Cocke¹,

Schulz²

2006

Springer Handbooks

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A general description of K X-ray de-excitation of titanium

Cited by 38 publications

References 7 publications

XMM-Newtonobservations of the supernova remnant RX J0852.0-4622/GRO J0852-4642

XMM-Newtonobservations of the supernova remnant RX J0852.0-4622/GRO J0852-4642

M shell ionization of Ar induced in near-central collisions with MeV protons

Ion-Atom Collisions - High Energy

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