Terrestrial cooling in northern Europe during the Eocene-Oligocene transition

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/148597/1/Hren_et_al_2013_PNAS-EOT_Cooling.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/148597/2/Hren_et_al_2013_PNAS-supplemental_data.pd

FIM/IAP/TEM STUDIES OF HYDROGEN IN METALS

Cet article est un compte rendu des premières étapes de nos travaux concernant la capture de l'hydrogène par les défauts du réseau métallique. Les imperfections de structure, ainsi que l'hydrogène, sont introduits par implantation ionique. La plupart des résultats tournent autour de la caractérisation des défauts structuraux par utilisation des techniques FIM et TEM. La faisabilité de l'application de l'IAP à l'étude de l'interaction hydrogène/défaut est aussi discutée.This paper is a report on the early stages of our work in the area of hydrogen trapping to defects in metals. Both the hydrogen and the defect structure are introduced by ion implantation. The results center on the characterization of the defect structure using both FIM and TEM techniques. The feasibility of applying the IAP to the study of hydrogen/defect interactions is also addressed

EXTENDED DEPTH PROFILING WITH THE IAP

Depth profiling with the FIM/IAP can be extremely accurate if done in conjunction with ring collapse counting. However, under UHV conditions depth scales are not easily assigned, especially if depths of 0.1 µm or more are required, such as those needed for range determinations in ion implantation studies. We describe a method using the IAP signal from the matrix, and tip parameters measured by FIM and transmission electron microscopy (TEM). Ni specimens were do field evaporated to 6 kV. Both FIM and TEM images were recorded before and after the IAP data was collected. The image was observed during analysis and the pulse number recorded when a ring collapsed. Each spectrum was signal -averaged to minimize storage. The pulse number is correlated with the spectral data. The cumulative Ni signal versus the ring number was then generated

Enhanced Field Emission from Diamond Coated Molybdenum Emitters

The field emission characteristics of individual Mo emitters were measured before and after diamond deposition, as well as before and after annealing. After coating without annealing, the emission current increased dramatically. Subsequent annealing resulted in further increases in emission and improved current stability. After coating, the energy distribution of the emitted electrons was found to shift with applied field. Annealing reduced the peak shift but resulted in the appearance of a second peak, coincident with the formation of Mo2C at the diamond-molybdenum interface. These changes in the emission spectra in conjunction with I-V data are discussed in terms of possible changes in emission mechanism