Introduction
The J-1500 CD spectrometer has recently been updated to provide better signal detection and resolution for a variety of sample choices. The enhanced optical system increases the light throughput and the new electronics include the latest in digital lock-in technology, which allows for a small signal in a very noisy environment to be detected. These features ensure that CD spectra can obtained by the J-1500 for strongly absorbing and high signal-to-noise (S/N) samples across the spectrum and into the vacuum-UV region.
The CD spectra measurement in the vacuum-UV region of (1R)-(+)-α-pinene gas and (1S)-(-)-α-pinene gas is reported below.
Experimental
| Measurement conditions | |
|---|---|
| Data acquisition interval | 0.1 nm |
| Spectral bandwidth | 1 nm |
| Accumulations | 1 |
| Scan speed | 20 nm/min |
| Response time | 1 sec |
Keywords
J-1500, circular dichroism, vacuum-UV region, α-pinene, gas measurement
Results
The vacuum-UV CD spectra of (1R)-(+)-α-pinene gas and (1S)-(-)-α-pinene gas are shown in Figure 1. The symmetrical CD spectra with high S/N were obtained at wavelengths as low as 163 nm and the sharp bands specific to gas samples can clearly be seen.
Conclusion
This application note demonstrates that gas samples can be obtained using the J-1500 CD spectrometer with high signalto-noise in the vacuum-UV region.