Induction Heating Thermal Desorption Spectrometer ESCO-TDS1700 IH

Key Features
The ESCO-TDS1700 IH is an Induction Heating Thermal Desorption Spectrometer designed for real-time molecular analysis. The system monitors molecules desorbed from a specimen utilizing a Quadrupole Mass Spectrometer (QMS), while the specimen undergoes programmed linear heating via electromagnetic induction within an ultra-high vacuum (UHV) environment (10^-7Pa or less).

・High-Sensitivity Observation in an Ideal Environment
Operating within a strict UHV environment suppresses the impact of secondary reactions,*1 providing an ideal, noise-free state for the highly sensitive detection of desorbed components

・Efficient Ultra-High Temperature Heating Beyond 1700°C
The electromagnetic induction heating mechanism delivers exceptionally efficient thermal energy directly to metallic materials such as steel, enabling advanced high-temperature measurements exceeding 1700°C.

・Versatile Low-Temperature TDS Capability
In addition to high-temperature analysis, the system is fully capable of low-temperature TDS (L-TDS) measurements. This allows researchers to evaluate diffusible hydrogen in steel—a critical driver of hydrogen embrittlement (delayed fracture).

・Automated Control & Intuitive Operation
The core system operations are fully automated via a robust Programmable Logic Controller (PLC), paired with a user-friendly touch-panel interface for seamless on-site operation.


Note:
*1: Refers to chemical reactions occurring between the heated specimen and ambient gas components during measurement, or reactions between desorbed components and ambient gas components.

【References】
・M. Kitahara, et al., "Evaluation of Corrosion Rate and Diffusible Hydrogen in High-Strength Steel Sheets Stressed under Corrosive Environments," Zairyo-to-Kankyo, 2018, 67.4: 172-178.

・C. Hanada, et al., "Suppression of bubble formation in levitated molten samples of Ti6Al4V with TiC for Hetero-3D at the International Space Station (ISS)," International Journal of Microgravity Science and Application, 2023, 40.3: 400301.

Equipped with a Load-Lock Chamber
A load-lock chamber is essential for achieving both high measurement throughput and maximum sensitivity. Our engineered load-lock chamber and sample transfer mechanism allow for the rapid introduction of only the sample into the ultra-high vacuum (UHV) analysis chamber.

Without a load-lock chamber, the analysis chamber must be vented to the atmosphere every time a sample is exchanged. Once exposed to ambient air, a massive volume of atmospheric components—particularly moisture—adheres to the chamber's interior surfaces, requiring a prolonged pump-down time before the system can return to its optimal vacuum level.

Low-Temperature TDS (L-TDS) Measurement of Diffusible Hydrogen in Steel
By enabling the precise measurement of pre-cooled steel specimens, this system successfully captures and quantifies diffusible hydrogen with exceptional accuracy—without allowing it to escape from body-centered cubic (BCC) steels, which are well-known for their high hydrogen diffusion coefficients. However, a critical challenge when handling cooled steel specimens is the inevitable adherence of frost. During the heating process, the desorption of this frost directly interferes with the hydrogen signal, introducing measurement errors and significantly increasing measurement uncertainty.

The optional Cold Trap engineered for the ESCO-TDS1700 IH completely overcomes this fundamental issue. By effectively trapping and isolating the frost, it reduces moisture interference to an absolute minimum. This allows researchers to reliably obtain clean, distortion-free diffusible hydrogen desorption spectra, ensuring the highest level of data integrity.

Quantification of Desorbed Gases
Quantification of desorbed gases is possible using the data processing program. To quantify desorbed gases, the sensitivity of the mass spectrometer must be calibrated periodically.
Sensitivity calibration using standard leaks requires preparing the same number of expensive standard leaks as there are gas types, and the calibration process is time-consuming. Furthermore, when using standard leaks for toxic gases, strict safety and health management is required.
Our current quantification program allows for the rapid, simple, and safe quantification of desorbed gases compared to the standard leak calibration method. Simply by periodically measuring our NIST-traceable hydrogen standard samples, you can obtain highly accurate results. The sensitivity correction method we developed can correct sensitivity for gases other than hydrogen, and it has been confirmed to agree well with quantification results calibrated using standard leaks based on the National Standards of the National Institute of Advanced Industrial Science and Technology (AIST).

[References]
●Norio Hirashita; Mari Urano; Hajime Yoshida. Gas emission measurement in the field of analysis. Journal of the Vacuum Society of Japan, 2014, 57.6: 214-218.

Technical Description: Thermal Desorption Spectroscopy (TDS)
This reference material provides information on desorption models and methods for determining activation energy used in the analysis of Thermal Desorption Spectroscopy.

Note: Clicking the link will open a PDF file.

Technical Description: Quantitative Analysis (Quantification in TDS Systems)
This material is based on the report by Hirashita and Uchiyama: "N. Hirashita and T. Uchiyama, BUNSEKI KAGAKU, 43, 757 (1994)."

The quantification of desorbed gases can be performed using thermal desorption spectra measured with a TDS system. When the pumping speed of the measurement chamber is sufficiently large compared to the change in pressure caused by the desorbed gas, the change in the partial pressure of the desorbed gas is proportional to the amount of desorption per unit time (desorption rate).

In a mass spectrometer, since the ion current is proportional to the partial pressure, the ion current is ultimately proportional to the desorption rate. Therefore, the total amount of desorption can be calculated from the integrated area intensity of the ion current.

By pre-determining the proportionality coefficient between the area intensity and the desorption amount using a Silicon (Si) sample implanted with a known dose of H+, the amount of hydrogen desorption for various samples can be determined based on the area intensity of m/z 2.

Furthermore, for molecules other than hydrogen, the proportionality coefficient for the target molecule can be calculated using parameters such as the relative ionization cross-section (ionization difficulty), fragmentation factor, and transmission rate between hydrogen and the target molecule. Using this proportionality coefficient, the quantification of various molecular species beyond hydrogen is also possible.

Induction Heating Thermal Desorption Spectrometer: IH-TDS1700 [Options]

Specialized Add-on Options
A suite of highly convenient specialized options, featuring an automated liquid nitrogen (LN₂) supply system and a high-precision, non-contact radiation thermometer.

Consumables

Category	Item
Reference Standards	⇒Hydrogen-Ion-Implanted Reference Standard
Fluorine Remover	⇒Fluorine Remover
Heating Accessories	⇒Alumina Crucible ⇒Tungsten Holder ⇒Holder Base ⇒Quartz Tube A (Medium) ⇒Quartz Tube A (Long)

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