laser-excited atomic fluorescence in a graphite furnace

Soot particle disintegration and detection by two

Soot particle disintegration and detection by two-laser excimer laser fragmentation fluorescence spectroscopy Christopher B. Stipe, Donald Lucas, Catherine P. Koshland, and Robert F. Sawyer A two-laser technique is used to study laser–particle interactions and

Nonlinear behaviour of atomic fluorescence in mercury

When mercury atoms, present with a buffer gas (N 2 or Ar) in a quartz cell or in a graphite furnace are excited into the 7 3 S 1 level by means of two pulsed dye lasers tuned at 253.652 nm (6 1 S o → 6 3 P 1) and 435.835 nm (6 3 P 1 → 7 3 S 1), a laser-like, collimated emission is observed along the axis of the cell at the green mercury line (7 3 S 1 → 6 3 P 2), 546.074 nm).

Chapter 3 Flame Atomic Absorption and Emission Spectrometry

Chapter 3 Flame Atomic Absorption and Emission Spectrometry 2.1 Introduction and History of AAS The first observation of atomic emission dates back to at least the first campfire where hominoids/humans observed a yellow color in the flame. This color was

Microdetermination of fluoride by laser

1991/2/1Fluoride at picogram levels is determined by using laser-excited molecular fluorescence of MgF produced in a graphite atomizer by adding magnesium to the fluoride sample. A pulsed dye-laser, tuned at 268 nm, is used to excite MgF and the resulting fluorescence is measured at 358 nm.

Metals Analysis by X

Purpose The purpose of this unit is to introduce the fundamental principles of x-ray fluorescence spectroscopy (XRF), apply this method to the analysis of simulated data for heavy metals in suspended particulate and sediment samples from Lake Nakuru and critically contrast XRF with alternative methods for determination of heavy metal concentrations.

Gang Wang Instrumental_Week6amp;7_CH8_11

2010/8/11Solid sample introduction: 1) Laser ablation – zap sample with laser and sweep atoms into flame/plasma 2) Direct sample insertion – place sample directly in atomizer (e.g. furnace) 3) Electrothermal atomizers – electrically heat graphite or tantalum boat 4) Arc/Spark ablation – coat sample on electrode or place in electrode well or cup 5) Glow discharge technique – see p 227

The analysis of heavy metals in Chinese herbal medicine by

Hanwen Sun, Lixin Li, Investigation of Distribution for Trace Lead and Cadmium in Chinese Herbal Medicines and Their Decoctions by Graphite Furnace Atomic Absorption Spectrometry, American Journal of Analytical Chemistry, 10.4236/ajac.2011.22026, 02, 02,

Atomic spectroscopy methods

Atomic Absorption • Assumptions: (i) Beer's law holds for the atoms in the flame or graphite furnace, and (ii) the concentration • of atoms in the flame or furnace is proportional to the concentration of analyte in the sample. • Calculations: The usual calibration

Chapter 3 Flame Atomic Absorption and Emission Spectrometry

Chapter 3 Flame Atomic Absorption and Emission Spectrometry 2.1 Introduction and History of AAS The first observation of atomic emission dates back to at least the first campfire where hominoids/humans observed a yellow color in the flame. This color was

Studying element vaporization and atomization processes

Indium vaporization and atomization processes were studied in a variable-pressure atomizer by laser-excited fluorescence spectrometry for various analyte masses over a wide range of buffer-gas pressures. It was found that the atomization processes are of intricate nature and depend on the element mass, pressure, and heating rate. Based on the data obtained over a wide range of pressures

Optical Atomic Spectrometry Chapter 8: An Introduction to

Solid sample introduction: 1) Laser ablation – zap sample with laser and sweep atoms into flame/plasma 2) Direct sample insertion – place sample directly in atomizer (e.g. furnace) 3) Electrothermal atomizers – electrically heat graphite or tantalum boat 4) Arc

Atomic Spectroscopy

Atomic spectroscopy in the laboratory: In atomic spectroscopy, the composition of an element in a sample is determined by its electromagnetic or mass spectrum. Other analytical methods that provide elemental determination include atomic absorption (AA), atomic emission, and mass spectrometry.

Physical analysis 2010

2011.01.03. 4 Atomic spectroscopy Graphite furnace atomizers Graphite tube furnaces are heated by electric current (up to a couple of thousands A) in a controlled way, up to about 3000 K. The graphite tube is surrounded by an inert gas to prevent oxidation/burn of

ACHEM Chapter 21 ~ Atomic Spectroscopy Flashcards

Laser atomic fluorescence excitation and emission spectra of sodium in an air-acetylene flame are shown here. In the excitation spectrum, the laser (line width 5 0.03 nm) was scanned through various wavelengths, while the detector monochromator (bandwidth 5 1.6 nm) was held fixed near 589 nm.

CiteSeerX — Silver Matrix Effects on Gold Atomization in a

Using both absorption and laser-induced fluorescence (LIF) spectroscopy, pictures of the furnace, probed with a pulsed laser tuned on a gold transition, were recorded during the atomization step. Spectra of the atomic and molecular fluorescence generated by the laser were recorded using classical electrothermal atomization LIF.

Gang Wang Instrumental_Week6amp;7_CH8_11

2010/8/11Solid sample introduction: 1) Laser ablation – zap sample with laser and sweep atoms into flame/plasma 2) Direct sample insertion – place sample directly in atomizer (e.g. furnace) 3) Electrothermal atomizers – electrically heat graphite or tantalum boat 4) Arc/Spark ablation – coat sample on electrode or place in electrode well or cup 5) Glow discharge technique – see p 227

Optical Atomic Spectrometry Chapter 8: An Introduction to

Solid sample introduction: 1) Laser ablation – zap sample with laser and sweep atoms into flame/plasma 2) Direct sample insertion – place sample directly in atomizer (e.g. furnace) 3) Electrothermal atomizers – electrically heat graphite or tantalum boat 4) Arc

Concepts, Instrumentation and Techniques in Atomic Absorption Spectrophotometry

sity with atomic fluorescence since sensitivity is directly related to the number of excited atoms which is a function of the intensity of the exciting radiation. Figure 1-4 illustrates how the three techniques just described are implemented.

Optical Atomic Spectrometry Chapter 8: An Introduction to

Solid sample introduction: 1) Laser ablation – zap sample with laser and sweep atoms into flame/plasma 2) Direct sample insertion – place sample directly in atomizer (e.g. furnace) 3) Electrothermal atomizers – electrically heat graphite or tantalum boat 4) Arc

Molecule formation in electrothermal atomizers:

Quantitative determination of non-metals by laser-excited molecular fluorescence spectrometry (LAMOFS) in electrothermally generated vapours in graphite tube furnaces 5.1 General aspects The improvement of detection limits by over-excitation in the glow

Spectroscopy: Principles, Theory, Techniques and Applications

The graphite furnace method can also analyze some solid or slurry samples. Because of its good sensitivity and selectivity, it is still a commonly used method of analysis for certain trace elements in aqueous (and other liquid) samples. • Atomic Fluorescence

Advances in Laser‐Excited Atomic Fluorescence and

Laser‐excited atomic fluorescence spectrometry (LEAFS) and laser‐enhanced ionization (LEI) are very sensitive methods for elemental analysis. LEAFS involves excitation of atoms by laser radiation followed by detection of the resulting fluorescence, while LEI involves laser excitation, which serves to enhance ionization, producing electrons and ions that can be collected in an electric field.

Novel laser atomic fluorescence spectrometer for

A standard graphite furnace module was used for sample atomization. The laser sources used provide narrowband selective laser excitation continuously tunable in the 200 - 400 nm range and are therefore suitable for resonant excitation of atomic transitions in

Fluorescence Excitation and Emission Fundamentals

Fluorescence Excitation and Emission Fundamentals Fluorescence is a member of the ubiquitous luminescence family of processes in which susceptible molecules emit light from electronically excited states created by either a physical (for example, absorption of

Spectroscopy

2005/6/22A graphite furnace can also be used for atomic fluorescence spectroscopy. This method is not as commonly used as atomic absorption or plasma emission spectroscopy. Plasma Emission spectroscopy - in some ways similar to flame atomic emission spectroscopy, it has largely replaced it.

Definition of Atomic

Atomic fluorescence is the optical emission from gas-phase atoms that have been excited to higher energy levels by absorption of electromagnetic radiation. The main advantage of fluorescence detection compared to absorption measurements is the greater sensitivity achievable because the fluorescence signal has a very low background.

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