Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Cumbee, R."'
Autor:
Stierhof, J., Kühn, S., Winter, M., Micke, P., Steinbrügge, R., Shah, C., Hell, N., Bissinger, M., Hirsch, M., Ballhausen, R., Lang, M., Gräfe, C., Wipf, S., Cumbee, R., Betancourt-Martinez, G. L., Park, S., Niskanen, J., Chung, M., Porter, F. S., Stöhlker, T., Pfeifer, T., Brown, G. V., Bernitt, S., Hansmann, P., Wilms, J., López-Urrutia, J. R. Crespo, Leutenegger, M. A.
A key requirement for the correct interpretation of high-resolution X-ray spectra is that transition energies are known with high accuracy and precision. We investigate the K-shell features of Ne, CO$_2$, and SF$_6$ gases, by measuring their photo io
Externí odkaz:
http://arxiv.org/abs/2203.03725
Autor:
Leutenegger, M. A., Kühn, S., Micke, P., Steinbrügge, R., Stierhof, J., Shah, C., Hell, N., Bissinger, M., Hirsch, M., Ballhausen, R., Lang, M., Gräfe, C., Wipf, S., Cumbee, R., Betancourt-Martinez, G. L., Park, S., Yerokhin, V. A., Surzhykov, A., Stolte, W. C., Niskanen, J., Chung, M., Porter, F. S., Stöhlker, T., Pfeifer, T., Wilms, J., Brown, G. V., López-Urrutia, J. R. Crespo, Bernitt, S.
Publikováno v:
Phys. Rev. Lett. 125, 243001 (2020)
We demonstrate a widely applicable technique to absolutely calibrate the energy scale of x-ray spectra with experimentally well-known and accurately calculable transitions of highly charged ions, allowing us to measure the K-shell Rydberg spectrum of
Externí odkaz:
http://arxiv.org/abs/2003.13838
Charge exchange (CX) is an important process in shock physics since it indicates an interaction between downstream ions and ambient neutral hydrogen, suggesting a presence of a collisionless shock. We present a high-resolution spectroscopy of an X-ra
Externí odkaz:
http://arxiv.org/abs/1812.06616
Autor:
Betancourt-Martinez, G. L., Beiersdorfer, P., Brown, G. V., Cumbee, R. S., Hell, N., Kelley, R. L., Kilbourne, C. A., Leutenegger, M. A., Lockard, T. E., Porter, F. S.
Publikováno v:
The Astrophysical Journal Letters, 868:L17 (8pp), 2018 December 1
We present the first high-resolution laboratory spectra of X-ray emission following L-shell charge exchange between nickel ions and neutral H2 and He. We employ the commonly used charge exchange models found in XSPEC and SPEX, ACX and SPEX-CX, to sim
Externí odkaz:
http://arxiv.org/abs/1811.12411
Publikováno v:
ApJ, 844, 1 (2017)
Charge exchange (CX) has emerged in X-ray emission modeling as a significant process that must be considered in many astrophysical environment--particularly comets. Comets host an interaction between solar wind ions and cometary neutrals to promote s
Externí odkaz:
http://arxiv.org/abs/1707.09096
Autor:
Wang, Qianxia, Loch, S. D., Li, Y., Pindzola, M. S., Cumbee, R., Stancil, P., McLaughlin, B., Ballance, C. P.
Collision strengths for electron-impact of fine-structure level excitation within the ground term of Ne$^{+}$ and Ne$^{2+}$ are calculated using the Breit-Pauli, Intermediate Coupling Frame Transformation, and DARC $R$-matrix methods. Maxwellian-aver
Externí odkaz:
http://arxiv.org/abs/1607.03158
Recent X-ray observations of star-forming galaxies such as M82 have shown the Ly beta/Ly alpha line ratio of Ne X to be in excess of predictions for thermal electron impact excitation. Here we demonstrate that the observed line ratio may be due to ch
Externí odkaz:
http://arxiv.org/abs/1603.04907
Publikováno v:
2016ApJS..224...31M
Charge exchange is an important process for the modeling of X-ray spectra obtained by the Chandra, XMM-Newton, and Suzaku X-ray observatories, as well as the anticipated Astro-H mission. The understanding of the observed X-ray spectra produced by man
Externí odkaz:
http://arxiv.org/abs/1602.02401
Autor:
Gu, L., Kaastra, J., Raassen, A. J. J., Mullen, P. D., Cumbee, R. S., Lyons, D., Stancil, P. C.
Motivated by recent claims of a compelling ~3.5 keV emission line from nearby galaxies and galaxy clusters, we investigate a novel plasma model incorporating a charge exchange component obtained from theoretical scattering calculations. Fitting this
Externí odkaz:
http://arxiv.org/abs/1511.06557
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