Pulse Characterization by Frequency-Resolved Optical Gating for Velocity Map Imaging of Xenon

A velocity map imaging (VMI) setup, which will be applied in the future to studying low-intensity strong-field ionization and the nuclear transition of the 229mTh isomer, is tested by multi-photon ionization (MPI) of xenon and the electron energy distribution is reconstructed. The ultra-short ionizing laser pulse of a 100MHz frequency comb is characterized by second harmonic intensity frequency-resolved optical gating (FROG) and interferometric FROG (iFROG). A good agreement of both methods is found, and a pulse duration of 183 fs is retrieved. The peak intensity of the ionizing pulse during MPI is calculated from the measured intra-cavity power and the retrieved pulse shape, which allows a theoretical characterization of the MPI process and a comparison to the experimental results

Sumbangan Power Otot Tungkai, Keseimbangan, Koordinasi dan Kepercayaan Diri terhadap Prestasi Poomsae Taekwondo (Studi Korelasional Prestasi Poomsae Altet Taekwondoin di Surakarta)

ABSTRAK Binuko Amarseto. A121308003. 2016. “Sumbangan Power Otot Tungkai, Keseimbangan, Koordinasi dan Kepercayaan Diri terhadap Prestasi Poomsae Taekwondo (Studi Korelasional Prestasi Poomsae Altet Taekwondoin di Surakarta)”. TESIS. Program Studi Ilmu Keolahragaan Pascasarjana Universitas Sebelas Maret Surakarta. Pembimbing: Prof. Dr. Sugiyanto (Pembimbing I), dan Prof. Dr. Agus Kristiyanto, M.Pd. (Pembimbing II). Prestasi Poomsae Taekwondo tidak hanya dicapai dengan hanya mengandalkan faktor ketrampilan teknik, tetapi juga haruslah memperhatikan faktor kondisi fisik dan psikis. Kondisi fisik baik berupa power otot tungkai, keseimbangan, dan koordinasi akan menentukan gerakan dalam setiap teknik Poomsae Taekwondo. Selain itu penilaian prestasi Poomsae Taekwondo terdapat penilaian lainnya yang berupa presentasi daripada ekspresi yang mencerminkan kepercayaan diri seorang atlet. Penelitian ini bertujuan untuk menemukan kebenaran tentang sumbangan power otot tungkai, keseimbangan, koordinasi dan kepercayaan diri terhadap prestasi Poomsae Taekwondo. Penelitian ini menggunakan pendekatan kuantitatif dengan metode penelitian korelasional, populasi dalam penelitian ini adalah atlet usia 13-15 tahun pada dojang se-Surakarta, jumlah sampel yang didapatkan berjumlah 40 responden. Variabel dalam penelitian ini terdiri dari 4 variabel independent yaitu power otot tungkai, keseimbangan, koordinasi dan kepercayaan diri dan 1 variabel dependent yaitu prestasi Poomsae Taekwondo. Teknik analisis data menggunakan analisis korelasi regresi dengan melakukan pengujian prasyarat uji normalitas dan linieritas. Pengujian hipotesis menggunakan analisis regresi dan korelasi masingmasing prediktor dan analisis regresi ganda serta korelasi ganda. Hasil penelitian menunjukkan bahwa power otot tungkai, keseimbangan, koordinasi dan kepercayaan diri berhubungan baik secara parsial dan secara simultan membentuk persamaan regresi. Dimana setiap power otot tungkai meningkat maka akan mengakibatkan peningkatan prestasi Poomsae Taekwondo sebesar 0,018, setiap peningkatan keseimbangan akan mengakibatkan peningkatan prestasi Poomsae Taekwondo sebesar 0,027, setiap peningkatan koordinasi akan mengakibatkan peningkatan prestasi Poomsae Taekwondo sebesar 0,042, setiap peningkatan kepercayaan diri akan mengakibatkan peningkatan prestasi Poomsae Taekwondo sebesar 0,054. Kesimpulan dari penelitian ini adalah power otot tungkai, keseimbangan, koordinasi dan kepercayaan diri berhubungan dan memiliki sumbangan baik secara parsial maupaun simultan terhadap prestasi Poomsae Taekwondo. Kata kunci : Kondisi fisik, Psikologis, Prestasi Poomsae Taekwondo

Circular dichroism and superdiffusive transport at the surface of BiTeI

et al.We investigate the electronic states of BiTeI after the optical pumping with circularly polarized photons. Our data show that photoexcited electrons reach an internal thermalization within 300 fs of the arrival of the pump pulse. Instead, the dichroic contrast generated by the circularly polarized light relaxes on a time scale shorter than 80 fs. This result implies that orbital and spin polarization created by the circular pump pulse rapidly decays via manybody interaction. The persistent dichroism at longer delay times is due to the helicity dependence of superdiffussive transport. We ascribe it to the lack of inversion symmetry in an electronic system far from equilibrium conditions.We acknowledge that the FemtoARPES project was financially supported by the RTRA Triangle de la Physique, and the ANR program Chaires d’Excellence (Nr. ANR-08-CEXCEC8-011-01).Peer Reviewe

Sulfide Minerals as Potential Tracers of Isochemical Processes in Contact Metamorphism: Case Study of the Kochumdek Aureole, East Siberia

Marly limestones from the Lower Silurian sedimentary units of the Tunguska basin (East Siberia, Russia) underwent metamorphism along the contact with the Early Triassic Kochumdek trap intrusion. At ≤ 2.5 m from the contact, the limestones were converted into ultrahigh-temperature marbles composed of pure calcite and sulfide-bearing calcsilicate layers. The sulfide assemblages in the gabbro and marbles were studied as potential tracers of spurrite-merwinite facies alteration. The gabbro-hosted sulfides show Fe-Ni-Cu-Co speciation (pyrrhotite and lesser amounts of chalcopyrite, pentlandite, and cobaltite) and positive δ34S values (+2.7 to +13.1‰). Both matrix and inclusion sulfide assemblages of prograde melilite, spurrite, and merwinite marbles consist dominantly of pyrrhotite and minor amounts of troilite, sphalerite, wurtzite, alabandite, acanthite, and galena. In contrast to its magmatic counterpart, metamorphic pyrrhotite is depleted in Cu (3–2000 times), Ni (7–800 times), Se (20–40 times), Co (12 times), and is isotopically light (about –25‰ δ34S). Broad solid solution series of (Zn,Fe,Mn)Scub, (Zn,Mn,Fe)Shex, and (Mn,Fe)Scub indicate that the temperature of contact metamorphism exceeded 850–900 °C. No metasomatism or S isotope resetting signatures were detected in the prograde mineral assemblages, but small-scale penetration of magma-derived K- and Cl-rich fluids through more permeable calcsilicate layers was documented based on the distribution of crack-filling Fe-K sulfides (rasvumite, djerfisherite, and bartonite)

Systematics of electronic and magnetic properties in the transition metal doped Sb2_2Te3_3 quantum anomalous Hall platform

The quantum anomalous Hall effect (QAHE) has recently been reported to emerge in magnetically-doped topological insulators. Although its general phenomenology is well established, the microscopic origin is far from being properly understood and controlled. Here we report on a detailed and systematic investigation of transition-metal (TM)-doped Sb$_2$Te$_3$. By combining density functional theory (DFT) calculations with complementary experimental techniques, i.e., scanning tunneling microscopy (STM), resonant photoemission (resPES), and x-ray magnetic circular dichroism (XMCD), we provide a complete spectroscopic characterization of both electronic and magnetic properties. Our results reveal that the TM dopants not only affect the magnetic state of the host material, but also significantly alter the electronic structure by generating impurity-derived energy bands. Our findings demonstrate the existence of a delicate interplay between electronic and magnetic properties in TM-doped TIs. In particular, we find that the fate of the topological surface states critically depends on the specific character of the TM impurity: while V- and Fe-doped Sb$_2$Te$_3$ display resonant impurity states in the vicinity of the Dirac point, Cr and Mn impurities leave the energy gap unaffected. The single-ion magnetic anisotropy energy and easy axis, which control the magnetic gap opening and its stability, are also found to be strongly TM impurity-dependent and can vary from in-plane to out-of-plane depending on the impurity and its distance from the surface. Overall, our results provide general guidelines for the realization of a robust QAHE in TM-doped Sb$_2$Te$_3$ in the ferromagnetic state.Comment: 40 pages, 13 figure

Termination-dependent surface properties in the giant-Rashba semiconductors BiTeX (X=Cl, Br, I)

Under the terms of the Creative Commons Attribution License 3.0 (CC-BY).The noncentrosymmetric semiconductors BiTeX(X=Cl,Br,I) show large Rashba-type spin-orbit splittings in their electronic structure making them candidate materials for spin-based electronics. However, BiTeI(0001) single-crystal surfaces usually consist of stacking-fault-induced domains of Te and I terminations implying a spatially inhomogeneous electronic structure. Here we combine scanning tunneling microscopy, photoelectron spectroscopy (ARPES, XPS), and density functional theory calculations to systematically investigate the structural and electronic properties of BiTeX(0001) surfaces. For X=Cl, Br we observe macroscopic single-terminated surfaces. We discuss chemical characteristics among the three materials in terms of bonding character, surface electronic structure, and surface morphology.This work was financially supported by the Deutsche Forschungsgemeinschaft through FOR1162 and partly by the Ministry of Education and Science of Russian Federation (Grant No. 2.8575.2013), the Russian Foundation for Basic Research (Grants No. 15-02-01797 and No. 15-02-02717), and Saint Petersburg State University (Project No. 11.50.202.2015).Peer Reviewe