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Books > Science & Mathematics > Science: general issues > Scientific standards
Since the turn of the century, the increasing availability of
photoelectron imaging experiments, along with the increasing
sophistication of experimental techniques, and the availability of
computational resources for analysis and numerics, has allowed for
significant developments in such photoelectron metrology. Quantum
Metrology with Photoelectrons, Volume 2: Applications and Advances
discusses the fundamental concepts along with recent and emerging
applications. Volume 2 explores the applications and development of
quantum metrology schemes based on photoelectron measurements. The
author begins with a brief historical background on ""complete""
photoionization experiments, followed by the details of state
reconstruction methodologies from experimental measurements. Three
specific applications of quantum metrology schemes are discussed in
detail. In addition, the book provides advances, future directions,
and an outlook including (ongoing) work to generalise these schemes
and extend them to dynamical many-body systems. Volume 2 will be of
interest to readers wishing to see the (sometimes messy) details of
state reconstruction from photoelectron measurements as well as
explore the future prospects for this class of metrology.
Time-resolved optical stimulation of luminescence has become
established as an important method for measurement of optically
stimulated luminescence. Its enduring appeal is easy to see with
the number of materials studied growing from the initial focus on
natural minerals such as quartz and feldspar to synthetic
dosimeters such as i !-Al2O3:C, BeO and YAlO3:Mn2+. The aim of
time-resolved optical stimulation is to separate in time the
stimulation and emission of luminescence. The luminescence is
stimulated from a sample using a brief light pulse. The ensuing
luminescence can be monitored either during stimulation in the
presence of scattered stimulating light or after the light-pulse.
The time-resolved luminescence spectrum measured in this way can be
resolved into components each with a distinct lifetime. The
lifetimes are linked to physical processes of luminescence and thus
provide a means to study dynamics involving charge transfer between
point-defects in materials. This book is devoted to time-resolved
optically stimulated luminescence and is suitable for researchers
with an interest in the study of point-defects using luminescence
methods. The book first sets the method within the context of
luminescence field at large and then provides an overview of the
instrumentation used. There is much attention on models for
time-resolved optically stimulated luminescence, two of which are
analytical and the third of which is based on computational
simulation of experimental results. To bring relevance to the
discussion, the book draws on examples from studies on quartz and
a-Al2O3:C, two materials widely investigated using this method. The
book shows how kinetic analysis for various thermal effects such as
thermal quenching and thermal assistance can be investigated using
time-resolved luminescence. Although use of light sums is an
obvious choice for this, contemporary work is discussed to show the
versatility of using other alternative methods such the dynamic
throughput.
Measurement techniques form the basis of scientific, engineering,
and industrial innovations. The methods and instruments of
measurement for different fields are constantly improving, and it's
necessary to address not only their significance but also the
challenges and issues associated with them. Strategic Applications
of Measurement Technologies and Instrumentation is a collection of
innovative research on the methods and applications of measurement
techniques in medical and scientific discoveries, as well as modern
industrial applications. The book is divided into two sections with
the first focusing on the significance of measurement strategies in
physics and biomedical applications and the second examining
measurement strategies in industrial applications. Highlighting a
range of topics including material assessment, measurement
strategies, and nanoscale materials, this book is ideally designed
for engineers, academicians, researchers, scientists, software
developers, graduate students, and industry professionals.
Two of the most powerful tools used to study magnetic materials are
inelastic neutron scattering and THz spectroscopy. Because the
measured spectra provide a dynamical fingerprint of a magnetic
material, those tools enable scientists to unravel the structure of
complex magnetic states and to determine the microcscopic
interactions that produce them. This book discusses the
experimental techniques of inleastic neutron scattering and THz
spectroscopy and provides the theoretical tools required to analyze
their measurements using spin-wave theory. For most materials, this
analysis can resolve the microscopic magnetic interactions such as
exchange, anisotropy, and Dzyaloshinskii-Moriya interactions.
Assuming a background in elementary statistical mechanics and a
familiarity with the quantized harmonic oscillator, this book
presents a comprehensive review of spin-wave theory and its
applications to both inelastic neutron scattering and THz
spectroscopy. Spin-wave theory is used to study several model
magnetic systems, including non-collinear magnets such as spirals
and cycloids that are produced by geometric frustration, competing
exchange interactions, or Dzyaloshinskii-Moriya interactions.
Several case studies utilizing spin-wave theory to analyze
inelastic neutron-scattering and THz spectroscopy measurements are
presented. These include both single crystals and powders and both
oxides and molecule-based magnets. In addition to sketching the
numerical techniques used to fit dynamical spectra based on
microscopic models, this book also contains over 70 exercises that
can be performed by beginning graduate students.
Since the turn of the century, the increasing availability of
photoelectron imaging experiments, along with the increasing
sophistication of experimental techniques, and the availability of
computational resources for analysis and numerics, has allowed for
significant developments in such photoelectron metrology. Quantum
Metrology with Photoelectrons, Volume 1: Foundations discusses the
fundamental concepts along with recent and emerging applications.
The core physics is that of photoionization, and Volume 1 addresses
this topic. The foundational material is presented in part as a
tutorial with extensive numerical examples and also in part as a
collected reference to the relevant theoretical treatments from the
literature for a range of cases. Topics are discussed with an eye
to developing general quantum metrology schemes, in which full
quantum state reconstruction of the photoelectron wavefunction is
the goal. In many cases, code and/or additional resources are
available online. Consequently, it is hoped that readers at all
levels will find something of interest and that the material
provides something rather different from existing textbooks.
The Transmission Electron Microscope (TEM) is the ultimate tool to
see and measure structures on the nanoscale and to probe their
elemental composition and electronic structure with sub-nanometer
spatial resolution. Recent technological breakthroughs have
revolutionized our understanding of materials via use of the TEM,
and it promises to become a significant tool in understanding
biological and biomolecular systems such as viruses and DNA
molecules. This book is a practical guide for scientists who need
to use the TEM as a tool to answer questions about physical and
chemical phenomena on the nanoscale.
This book describes modern focused ion beam microscopes and
techniques and how they can be used to aid materials metrology and
as tools for the fabrication of devices that in turn are used in
many other aspects of fundamental metrology. Beginning with a
description of the currently available instruments including the
new addition to the field of plasma-based sources, it then gives an
overview of ion solid interactions and how the different types of
instrument can be applied. Chapters then describe how these
machines can be applied to the field of materials science and
device fabrication giving examples of recent and current activity
in both these areas.
Photoemission (also known as photoelectron) spectroscopy refers to
the process in which an electron is removed from a specimen after
the atomic absorption of a photon. The first evidence of this
phenomenon dates back to 1887 but it was not until 1905 that
Einstein offered an explanation of this effect, which is now
referred to as ""the photoelectric effect"".Quantitative Core Level
Photoelectron Spectroscopy: A Primer tackles the pragmatic aspects
of the photoemission process with the aim of introducing the reader
to the concepts and instrumentation that emerge from an
experimental approach. The basic elements implemented for the
technique are discussed and the geometry of the instrumentation is
explained. The book covers each of the features that have been
observed in the X-ray photoemission spectra and provides the tools
necessary for their understanding and correct identification.
Charging effects are covered in the penultimate chapter with the
final chapter bringing closure to the basic uses of the X-ray
photoemission process, as well as guiding the reader through some
of the most popular applications used in current research.
he workshop on high-temperature guarded-hot-plate and pipe
measurements was held on March 19-20, 2012 at the National
Institute of Standards and Technology (NIST) in Gaithersburg,
Maryland, USA. The workshop was co-sponsored by the ASTM
International Subcommittee C16:30 on Thermal Measurement and by the
National Institute of Standards and Technology. This was the second
workshop in a series that specifically focused on the needs of
operators conducting these types of measurements.
This handbook is a both a description of the current practice at
the National Institute of Standards and Technology, and a
compilation of the theory and lore of gauge block calibration. Most
of the chapters are nearly self-contained so that the interested
reader can, for example, get information on the cleaning and
handling of gauge blocks without having to read the chapters on
measurement schemes or process control, etc. This partitioning of
the material has led to some unavoidable repetition of material
between chapters. The basic structure of the handbook is from the
theoretical to the practical. Chapter 1: basic concepts and
definitions of length and units; Chapter 2: history of gauge
blocks, appropriate definitions and a discussion of pertinent
national and international standards; Chapter 3: physical
characteristics of gauge blocks, including thermal, mechanical and
optical properties; Chapter 4: a description of statistical process
control (SPC) and measurement assurance (MA) concepts; and Chapters
5 and 6: details of the mechanical comparisons and interferometric
techniques used for gauge block calibrations. Full discussions of
the related uncertainties and corrections are included. Finally,
the appendices cover in more detail some important topics in
metrology and gauge block calibration.
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