Christopher Hamann
Museum für Naturkunde
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Publication
Featured researches published by Christopher Hamann.
Geophysical Research Letters | 2016
Christopher Hamann; Robert Luther; Matthias Ebert; Lutz Hecht; Alexander Deutsch; Kai Wünnemann; Sebastian Schäffer; Jens Osterholz; Bernd Lexow
Planetary collisions in the solar system typically induce melting and vaporization of the impactor and a certain volume of the target. To study the dynamics of quasi-instantaneous melting and subsequent quenching under postshock P-T conditions of impact melting, we used continuous-wave laser irradiation to melt and vaporize sandstone, iron meteorite, and basalt. Using high-speed imaging, temperature measurements, and petrologic investigations of the irradiation targets, we show that laser-generated melts exhibit typical characteristics of impact melts (particularly ballistic ejecta). We then calculate the entropy gains of the laser-generated melts and compare them with the entropy gains associated with the thermodynamic states produced in hypervelocity impacts at various velocities. In conclusion, our experiments extend currently attainable postshock temperatures in impact experiments to ranges commensurate with impacts in the velocity range of 4–20u2009kmu2009s–1 and allow to study timescales and magnitudes of petrogenetic processes in impact melts.
Geochimica et Cosmochimica Acta | 2013
Christopher Hamann; Lutz Hecht; Matthias Ebert; Richard Wirth
Meteoritics & Planetary Science | 2018
Dieter Stoffler; Christopher Hamann; Knut Metzler
Geochimica et Cosmochimica Acta | 2016
Christopher Hamann; Dieter Stoffler; Wolf Uwe Reimold
Geophysical Research Letters | 2016
Christopher Hamann; Robert Luther; Matthias Ebert; Lutz Hecht; Alexander Deutsch; Kai Wünnemann; Sebastian Schäffer; Jens Osterholz; Bernd Lexow
Meteoritics & Planetary Science | 2018
Thomas Kenkmann; Alexander Deutsch; Klaus Thoma; Matthias Ebert; Michael H. Poelchau; Elmar Buhl; Eva-Regine Carl; Georg Dresen; Anja Dufresne; Nathanaël Durr; Lars Ehm; Christian U. Grosse; Max Gulde; Nicole Güldemeister; Christopher Hamann; Lutz Hecht; Stefan Hiermaier; Tobias Hoerth; Astrid Kowitz; Falko Langenhorst; Bernd Lexow; Hanns-Peter Liermann; Robert Luther; Ulrich Mansfeld; Dorothee Moser; Manuel Raith; Wolf Uwe Reimold; Martin Sauer; Frank Schäfer; Ralf Schmitt
Meteoritics & Planetary Science | 2017
Matthias Ebert; Lutz Hecht; Christopher Hamann; Robert Luther
Meteoritics & Planetary Science | 2018
Christopher Hamann; Agnese Fazio; Matthias Ebert; Lutz Hecht; Richard Wirth; Luigi Folco; Alexander Deutsch; Wolf Uwe Reimold
Geochimica et Cosmochimica Acta | 2017
Nadia Van Roosbroek; Christopher Hamann; Seann S. McKibbin; Ansgar Greshake; Richard Wirth; L Pittarello; Lutz Hecht; Philippe Claeys; Vinciane Debaille
Meteoritics & Planetary Science | 2018
Jakob Wilk; Christopher Hamann; Agnese Fazio; Robert Luther; Lutz Hecht; Falko Langenhorst; Thomas Kenkmann