Melting of Al Induced by Laser Excitation of 2p Holes

Novel photon sources—such as XUV- or X-ray lasers—allow to selectively excite core excitations in materials. We study the response of a simple metal, Al, to the excitation of 2p holes using molecular dynamics simulations. During the lifetime of the holes, the interatomic interactions in the slab are changed; we calculate these using WIEN2k. We find that the melting dynamics after core-hole excitation is dominated by classical electron–phonon dynamics. The effects of the changed potential surface for excited Al atoms occur on the time scale of 100 fs, corresponding to the Debye time of the lattice

Superior regularity in erosion patterns by planar subsurface channeling

The onset of pattern formation through exposure of Pt(111) with 5 keV Ar+ ions at grazing incidence has been studied at 550 K by scanning tunneling microscopy and is supplemented by molecular-dynamics simulations of single ion impacts. A consistent description of pattern formation in terms of atomic scale mechanisms is given. Most surprisingly, pattern formation depends crucially on the angle of incidence of the ions. As soon as this angle allows subsurface channeling of the ions, pattern regularity and alignment with respect to the ion beam greatly improves. These effects are traced back to the positionally aligned formation of vacancy islands through the damage created by the ions at dechanneling locations

Mechanisms of pattern formation in grazing-incidence ion bombardment of Pt(111)

Ripple patterns forming on Pt(111) due to 5 keV Ar+ grazing-incidence ion bombardment were investigated by scanning tunneling microscopy in a broad temperature range from 100 to 720 K and for ion fluences up to 3x10(20) ions/m(2). A detailed morphological analysis together with molecular dynamics simulations of single ion impacts allow us to develop atomic scale models for the formation of these patterns. The large difference in step edge versus terrace damage is shown to be crucial for ripple formation under grazing incidence. The importance of distinct diffusion processes-step adatom generation at kinks and adatom lattice gas formation-for temperature dependent transitions in the surface morphology is highlighted. Surprisingly, ion bombardment effects like thermal spike induced adatom production and planar subsurface channeling are important for pattern ordering

PENGEMBANGAN USAHA MILIK DESA (BUMDes) DENGAN MENGOLAH PISANG KRISPI DAN KRIPIK KALAKAI

       Community service is a tangible manifestation of the contribution of independent KKN-T students in 2022, Palangka Raya University, Beringin Tunggal Jaya Village in realizing the tri dharma pillar of higher education which is expected to be a bridge between the community and students in establishing friendship in social life. BUMDes is a business managed by the village government and a legal entity regulated in Law Number 23 of 2014. Crispy bananas and kalakai chips are innovations from students in developing village-owned businesses through bananas and kalakai. The implementation method used is through the socialization of making crispy bananas and kalakai chips to PKK mothers. This writing aims to determine the development of Village-Owned Enterprises (BUMDes) by processing banana chips and Kalakai chips into frequently consumed food. The conclusion of the writing shows that there is potential to develop Village Owned Enterprises (BUMDes) by processing bananas and kalakai into crispy bananas and kalakai chip