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Alkali Metals

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals

Concentration Cells

Concentration Cells

A concentration cell is an electrochemical cell in which the emf arises from a difference in concentration of a species between two half-cells. Unlike galvanic cells, where electrical energy comes from a chemical reaction, the driving force here is the transfer of matter from a region of higher concentration to lower concentration. The overall process is therefore physical in nature. A classic illustration is a cell made of two chlorine electrodes operating at different chlorine gas...

Vaporization

Vaporization

The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...

Volatilization

Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...

Alkali Aggregate Reaction in Concrete

Alkali Aggregate Reaction in Concrete

The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...

Distillation: Vapor–Liquid Equilibria

Distillation: Vapor–Liquid Equilibria

Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube with...

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High-density, high-temperature alkali vapor cell.

V O Lorenz¹, X Dai, H Green

¹JILA, National Institute of Standards and Technology, University of Colorado, Boulder, Colorado 80309-0440, USA. virginia.lorenz@colorado.edu

The Review of Scientific Instruments

|January 7, 2009

Summary

We developed a novel vapor cell for high-temperature alkali metal spectroscopy. This design allows optical access via reflection and withstands corrosive potassium vapor up to 800°C.

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Area of Science:

Atomic, Molecular, and Optical Physics
Materials Science and Engineering

Background:

High-temperature alkali metal vapors are crucial for various spectroscopic applications.
Existing vapor cells face challenges with corrosion and limited optical access at high densities and temperatures.

Purpose of the Study:

To present a robust vapor cell design for resonant optical spectroscopy.
To enable studies in high-density, high-temperature alkali metal environments.

Main Methods:

The design utilizes optical access via reflection from a sapphire window interface.
The cell is constructed to resist corrosion from reactive alkali metals like potassium.
Testing involved exposing the cell to potassium vapor up to 800°C and number densities of 10^19 cm^-3.

Main Results:

The novel vapor cell design successfully enables resonant optical spectroscopy.
The cell demonstrates resistance to corrosion from potassium vapor at temperatures up to 800°C.
The cell maintained integrity for an average of 100 hours above 500°C, enduring approximately 10 heating/cooling cycles.

Conclusions:

This vapor cell design is suitable for high-density, high-temperature alkali metal vapor spectroscopy.
The cell's durability and optical access method offer significant advantages for advanced research.
Further applications in atomic physics and materials science are anticipated.