Introduction

For high-precision CD spectrum measurement, [Wavelength Accuracy] and [Wavelength Repeatability] are important parameter to obtain precise spectrum. 253.652 nm emission line spectrum of mercury lamp is good reference to verify [Wavelength Accuracy] and [Wavelength Repeatability] of CD spectrometer.

This article shows the validation result of [Wavelength Accuracy] and [Wavelength Repeatability] of CD spectrometer by using mercury lamp.

J-1500 CD spectrometer

Experimental

Using the mercury lamp which is installed to JASCO’s CD spectrometer as standard, 253.652 nm mercury lamp emission line spectrum was measured five times.

Measurement conditions
Photometric mode:  DC
HT voltage:  Manual (300 V)
Measurement range:  250-260 nm
Data acquisition interval:  0.025 nm
Response:  0.125 sec
Scan speed:  10 nm/min

Keywords

Wavelength accuracy, Wavelength repeatability, Mercury lamp

Results

Figure 1, 2 and Table 1 show the repeat measurement results of the 253.652 nm mercury lamp emission line spectrum. Five spectra show good agreement, so high [Wavelength Accuracy] and [Wavelength Repeatability] were verified.

Figure 1. Mercury lamp emission line spectra

Figure 2. Mercury lamp emission line spectra (right: Zoom view)

Table 1. Wavelength repeatability