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Home / Applications / Overview of the Various Options for Time Course Measurement using FTIR

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  • Technique

Overview of the Various Options for Time Course Measurement using FTIR

By Carlos Morillo

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April 25, 2024

Introduction

FTIR-4000 and 6000 Series spectrometers
FTIR-4000 and 6000 Series Spectrometers

FTIR offers three methods for time course measurement: interval measurement, rapid-scan, and step-scan; the time resolution is 1 sec, 50 msec, 5 msec (optional: 10 nsec) respectively.

Here we will review the basic features and measurement for each method. Each method uses a different type of scanning method for  the moving mirror in the interferometer. “Interval measurement” is performed with regular scanning and “rapid-scan measurement” uses a faster scan rate of the moving mirror. Using “step-scan measurement,” the moving mirror stops at each data-sampling point and perturbed at each of the points.

Experimental

Measurement Conditions
Interval Measurement *1Time Res.: 1 sec ~Application: structural transition of a sample, monitoring of gas concentration
Measurement Ex.: Measure the transition of CO2 concentration in room air. (Fig. 1) Interval measurement is effective for long-time monitoring of gas analysis. *1 JASCO interval measurement program can be used for up to 60001 scans or 24 days.
Rapid-Scan MeasurementTime Res.: 50 msec ~Application: photo-polymerization reaction, orientation relaxation of polymer film
Measurement Ex.: The curing process of a UV cured resin was measured, a photo-polymerization reaction. (Fig. 2) The peak intensity transition at 1637 cm-1 (bottom of Fig. 2) is attributed to the C=C stretch. The peak intensity rapidly decreased responding to the UV irradiation and continued to decrease moderately indicating that the initial reaction and reaction process for photo-polymerization was observed very accurately.
Step-Scan Measurement*2Time Res.: 5 msec ~*3Application: relaxation of liquid crystal orientation
Measurement Ex.: The relaxation process of the orientation of a liquid crystal in response to an electric field was measured. (Fig. 3) The peak intensity transition at 2925 cm-1 (bottom of Fig. 3), is attributed to the C-H stretch. The peak intensity fluctuated responding to the power voltage being applied and stopped, and decreased in two phases - rapidly and then moderately. It is known that the liquid crystal in the area near the electrode has a faster orientation relaxation than the bulk and this difference can be observed.
*2 limited to the materials with repetitive response. *3 10 nsec ~ is optionally available.
CO2 concentration transition
Figure 1. CO2 concentration transition

 

Curing process of a UV cured resin
Figure 2. Curing process of a UV cured resin

 

Relaxation process of liquid crystal orientation
Figure 3. Relaxation process of liquid crystal orientation

Keywords

280-SO-0007, FTIR, Step-scan, Rapid scan, Interval scan, resin curing, CO2,

This document has been prepared based on information available at the time of publication and is subject to revision without notice. Although the contents are checked with the utmost care, we do not guarantee their accuracy or completeness. JASCO Corporation assumes no responsibility or liability for any loss or damage incurred as a result of the use of any information contained in this document. Copyright and other intellectual property rights in this document remain the property of JASCO Corporation. Please do not attempt to copy, modify, redistribute, or sell etc. in whole or in part without prior written permission.

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About the Author

Dr. Carlos Morillo received his Post Doc at Advanced Industrial Science & Technology in Fukuoka and was a Research Scientist at Kyushu University in Japan where he lived for several years. Carlos received his Doctor of Engineering from Kyushu University and his Masters and BS from Simon Bolivar University in Caracas Venezuela. He is an Applications Scientist at JASCO.

JASCO Application Note

Overview of the Various Options for Time Course Measurement using FTIR

Introduction

FTIR-4000 and 6000 Series spectrometers
FTIR-4000 and 6000 Series Spectrometers

FTIR offers three methods for time course measurement: interval measurement, rapid-scan, and step-scan; the time resolution is 1 sec, 50 msec, 5 msec (optional: 10 nsec) respectively.

Here we will review the basic features and measurement for each method. Each method uses a different type of scanning method for  the moving mirror in the interferometer. “Interval measurement” is performed with regular scanning and “rapid-scan measurement” uses a faster scan rate of the moving mirror. Using “step-scan measurement,” the moving mirror stops at each data-sampling point and perturbed at each of the points.

Experimental

Measurement Conditions
Interval Measurement *1Time Res.: 1 sec ~Application: structural transition of a sample, monitoring of gas concentration
Measurement Ex.: Measure the transition of CO2 concentration in room air. (Fig. 1) Interval measurement is effective for long-time monitoring of gas analysis. *1 JASCO interval measurement program can be used for up to 60001 scans or 24 days.
Rapid-Scan MeasurementTime Res.: 50 msec ~Application: photo-polymerization reaction, orientation relaxation of polymer film
Measurement Ex.: The curing process of a UV cured resin was measured, a photo-polymerization reaction. (Fig. 2) The peak intensity transition at 1637 cm-1 (bottom of Fig. 2) is attributed to the C=C stretch. The peak intensity rapidly decreased responding to the UV irradiation and continued to decrease moderately indicating that the initial reaction and reaction process for photo-polymerization was observed very accurately.
Step-Scan Measurement*2Time Res.: 5 msec ~*3Application: relaxation of liquid crystal orientation
Measurement Ex.: The relaxation process of the orientation of a liquid crystal in response to an electric field was measured. (Fig. 3) The peak intensity transition at 2925 cm-1 (bottom of Fig. 3), is attributed to the C-H stretch. The peak intensity fluctuated responding to the power voltage being applied and stopped, and decreased in two phases - rapidly and then moderately. It is known that the liquid crystal in the area near the electrode has a faster orientation relaxation than the bulk and this difference can be observed.
*2 limited to the materials with repetitive response. *3 10 nsec ~ is optionally available.
CO2 concentration transition
Figure 1. CO2 concentration transition

 

Curing process of a UV cured resin
Figure 2. Curing process of a UV cured resin

 

Relaxation process of liquid crystal orientation
Figure 3. Relaxation process of liquid crystal orientation

Keywords

280-SO-0007, FTIR, Step-scan, Rapid scan, Interval scan, resin curing, CO2,

This document has been prepared based on information available at the time of publication and is subject to revision without notice. Although the contents are checked with the utmost care, we do not guarantee their accuracy or completeness. JASCO Corporation assumes no responsibility or liability for any loss or damage incurred as a result of the use of any information contained in this document. Copyright and other intellectual property rights in this document remain the property of JASCO Corporation. Please do not attempt to copy, modify, redistribute, or sell etc. in whole or in part without prior written permission.
28600 Mary’s Court, Easton, MD 21601 USA • (800) 333-5272 • Fax: (410) 822-7526 • jascoinc.com/applications

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