- Chuydn miic cua cac didn tir miic donor xudng xoing hda tri, biic xa cac photon vdi nang lugng: hv2 = Eg Ê
b.He kich thich pho huynh quang va tan xa Raman
De kfch thfch pho huynh quang ciia cac hgp chat ban din viing cam rong, chiing tdi da dung so đ nhu d hinh 10.
Den Thuy ngan HBO- 502
May dan sic OR
May tinh Khuech dai Lock -in
Nhan quang dien
Hinh 10 : So đ kfch thfch pho huynh quang ciia cac chat ban din xoing cam rdng dimg den thuy ngan ap suat sidu cao HBO-502 Hoat đng ciia so đ kfch thfch nay la nhu sau:
Biic xa phat ra tir den thuy ngan ap suit sidu cao HBO-502 gdm nhiing vach cd cudng do rat manh dugc thau kfnh thach anh L, (fj = 75mm) hdi tu vao khe may don sic QR. Nhd quay du xfch ciia may nay ma lin lugt dugc tu
Idn miu bing mot thau kfnh hdi tu thach anh Lj (f2 = 73mm) dat trudc khe ra
cua maỵ Anh sang huynh quang phat ra ttr miu dugc thau kfnh thuy tinh L3 (f^ = 94mm) hdi tu vao khe ciia may dan sic each tir kep GDM-1000. Sau khi qua nhan quang didn M12FC-51 (hoac R-928), tfn hieu quang dugc chuyen thanh tfn hieu dien xa dugc khuech dai bing bg khuech dai lock-in SR-830 va cudi ciing, tfn hieu dugc dua vao may tfnh xir ly cho pho biic xa cua miu cin nghidn ciiụ
Anh sang tan xa do miu phat ra cd cudng do rat nhd so \'di cudng do cua chiim anh sang kich thfch, vi \'ay he kfch thfch pho tan xa Raman can phai tan dung tdi da nang lugng cua chum anh sang kfch thfch va tap trung hau nhu toan bg nang lugng anh sang tan xa vao khe cua may don sic. Xuat phat tir hai
yeu ciu tren chiing tdi da thiét kéva xay dung he kfch thfch phd tan xa Raman bing laser argon va He-Ne ( hinh 11).
Khs-ir4v<K-i}sa£
Hinh 11 :He kfch thfch phd tan xa Raman bing laser argon va He - Ne
Vdi he kfch thfch nay nhd cd thau kinh hdi tu Oj (fj = 7.7cm ) va cac guong phing G^ , G2 ma chum anh sang laser di lai nhieu lan trong cuvet chiia miu, cdn anh sang tan xa Raman do miu phat ra dugc guong ciu 1dm G3 (f3 = 16 cm, dudng kfnh d=10.5 cm ) tap trung vao khe may don sic each tir kep GDM- 1000 , vi the cudng do vach tan xa Raman tang Idn gip ba lin (hinh 12)
Hinh 12 : Su phu thuoc cudng do cua vach tan xa Raman Av= 1004 cm^ ciia C7H8 vao cac dung cu quang hgc cua he kfch thfch (AJ-J =488 nm)
ạ Khdng guong phing G,, G.. khdng guong cau G3 b. Khdng guong phing Gj, G.. cd guong cau G, c. Cd guong phing G,, G., khdng guong ciu G3 d. Cd guong phing Gj, G., cd guong ciu G3