Empty Glass Cells

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Item #	Qty	Description
GC251	1	Empty Glass Cell with Ø25 mm Fused Windows, 100 mm Long, One Fill Tube
GCH25-75	1	Heater Assembly for Ø9, Ø19, or Ø25 mm x 75 mm Glass Cells, 15 W per Heating Element
ER4-P4	1	Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
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Our Ø25 mm glass cells can also be mounted in our GCH25-75 Heater and four ER4 cage rods.

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The GCV251 and GCV501 Empty Glass Cells feature a J. Young Valve that can be closed to maintain a high-vacuum seal.

Features

• Glass Cells for Spectroscopic Applications
• 100 mm Long Cell with Ø25 mm or Ø50 mm Windows at Both Ends
• Borosilicate Substrate for Cell and Windows
• High Transmission from 350 to 2200 nm
• Available with One Tube for Filling or Two Tubes for Flow
• Single Fill Tube Cells Also Available with Genuine J. Young^® Valve for Sealing
• Custom Design and Manufacturing Services Available (Contact Tech Support)
• Ø25 mm Cells Compatible with a Variety of Glass Cell Heaters

These empty borosilicate glass cells can be filled with vapors of specific atomic elements or molecular compounds, each of which has a well-defined absorption spectrum. Cells are available with either one or two fill tubes and either Ø25 mm or Ø50 mm windows. A single fill tube is useful when sealing a cell while a cell with two fill tubes can be used to maintain constant gas flow. We also offer an empty cell with a single fill tube and a J. Young valve to seal the cell with a high-vacuum, greaseless stopcock (see below for details). Each fill tube has a 1/2" outer diameter for compatibility with Ø1/2" compression fittings. Custom reference cells can be manufactured upon request, including different cell lengths, cell diameters, or fill tube configurations. Please contact Tech Support with inquiries.

Each cell is made from borosilicate glass, a rugged material known to resist chipping and cracking, and has high transmission from 350 nm to 2.2 µm. The cell windows are fused, allowing the cell to hold a vacuum below 10^-7 torr. It can also withstand pressures up to 5 psi. The post-production cleaning process for these cells consists of an ultrasonic cleaning step using water, followed by an acetone rinse. Then the cell is connected to a vacuum system and leak tested.

These cells are commonly used in spectroscopic applications such as tunable diode laser calibration, stabilization of laser frequencies, and calibration of wavelength meters. Refer to the Application tab for a general overview of use with absorption spectroscopy. We also offer pre-assembled Herriott cells for gas absorption spectroscopy applications, as well as filled and sealed vapor reference cells.

Mounting & Heating Options
These cells can be mounted in our V-Clamp Mounts, which are available in standard, kinematic, or Ø1.5" post-compatible versions. Please check that the cell diameter is supported by the mount. Cells with Ø25 mm windows can be mounted in our GCH25-75 Glass Cell Heater as illustrated in the photo to the upper right. This requires swapping out the included Ø6 mm cage rods with four ER4 4" long cage rods. We also offer the GCH25R Cap Heater for cells with Ø25 mm windows. This heater attaches directly to the end of a cell. Our HT10K and TLK-H Resistive Foil Heaters wrap around Ø25 mm glass cells and feature adhesive backing.

Absorption Spectroscopy

The reference substance pumped into the glass cell is associated with a unique absorption spectrum that serves as its fingerprint, the contents of a reference cell can be determined via a linear absorption measurement (as depicted by the simplified schematic below). By scanning a tunable diode laser over a wavelength range and detecting light absorption with a photodetector, a series of peaks will be recorded, which is characteristic of the vapor inside the cell. Please note that we also offer pre-filled and sealed vapor reference cells with quartz or borosilicate substrates.