真空紫外区α-pinene气体的CD测量

J-1500 CD光谱仪最近进行了更新，为各种样品的选择提供了更好的信号检测和分辨率。增强的光学系统增加了光的吞吐量，新的电子设备包括最新的数字锁定技术，它允许在一个非常嘈杂的环境中检测到一个小的信号。这些特征保证了J-1500可以获得CD光谱的强吸收和高信噪比（S/N）样品，并进入真空紫外区域。结论：该应用说明表明，使用J-1500 CD光谱仪可以在真空-紫外区域以高信号噪声获得气体样品。Application Note UV measurement of a-pinene gas in the vacuum-UV2/2Application Noteregion C D measurement of a-pinene gas in the vacuum- UV region Introduction Th e J-1500 CD s p ectrometer has r ecen tl y been up d a t ed to pr ov i de b e t t e r si g n al d etectio n an d re s o lu tion f o r a v a ri e t y of s a mpl e c ho i ces . T h e enh a n c ed o p tical s y s t e m i nc re a ses the light t h rou ghp u t and the n e w e l ectron i cs inc lu de the l a t es t in d i g it a l lo c k -in t e c h n o logy， w h ich a llo ws fo r a sm a l l s i g n a l i n a v er y no i s y e n vi ro n m en t t o b e d e t ecte d . The s e fea t ures e n su r e that CD s p ec t ra can ob t ained by t h e J -1500f o r s t r o n gl y ab s o r b in g and hi g h s i g n al-to -n o is e (S /N) sa m pl e s a c ross th e spe ctru m and i n t o th e v ac u u m-U V r eg i o n. JASCO J -1500 CD spectrometer View product i nformation at w ww.j a s c oi nc.cOm Th e CD s p ec t r a m e a su r e men t i n t he va cuu m-U V re g i o n of (1R)-(+)-a-p i nene g as and (1S)-(-)-a-pi n ene g as is r epo r ted b e l ow. Keywords J -1500， c ir c u l a r d i c h rois m ，v ac u u m-U V regi o n ， a -p ine n e， g a s m e a suremen t Experimental Measurement conditions Data acquisition interval 0.1nm Spectral bandwidth 1nm Accumulations 1 Path length 10nm Scan speed 20 nm/min Response time 1 sec 28600 Mary's Court ， Ea s t on， MD 21601 U S A Results The vacu u m-UV CD spec tr a of (1R)-(+)-a-pi n ene gas and (1S)-(-)-a-p in ene gas are s h o w n i n F i gure 1. The sym m e tri cal CD s p ectr a wi th h igh S/N were o btained a t wa v eleng th s a s l ow a s 163 nm a n d the sh a r p ban ds s p ec i f i c t o ga s s am p l es c an clea r l y b e see n . Figure 1. Vacuum-UV CD spectra of a-pinene gas Conclusion Th is a pp li cati o n n ot e d e m on s trat es th at g as s a mples c a n b e ob t a in ed u sin g th e J-1500 CD sp ec t r o m eter with hi g h s ign al -t o-n o i se i n th e vac uu m-UV region . 28600 Mary's Cour t ， E asto n ， MD 21601US A