International Journal of Academic Multidisciplinary Research (IJAMR)   Year: 2021 | Volume: 5 | Issue: 4 | Page No.: 34-41 Optical Parapets of Gum Arabic Syntheses by (Sol Gal and chemo - thermos) Method and doping with Aluminum Oxide samples Fatima Kh. Sharif Hussain , Rawia AbdElgani , Al desogi Omer Hamed , Abdalsakhi. S. Mohammed Abstract: Syntheses Gum Arabic Made by (Sol Gal and chemo - thermos) Method and doping with Aluminum Oxide, and used UV-VS mini 1240 spectrophotometer to study the optical parapets. The absorbance in range(410 to 555) nm for all samples ,the maximal absorbance of sol gel at 465 nm corresponding photon energy 2.667 eV, and for chemo thermos sample at 576 nm corresponding photon energy 2.605 eV. The value of absorption coefficient (a) equal 4.25 cm-1 for (Sol Gal) Method sample in the visible region(465 nm ) , but for (chemo - thermos) Method sample equal 4.36 cm-1 at the (476 nm ) wavelength. The energy band gap (Eg) value of (Sol Gal) Method sample equal (2.397) eV but for (chemo - thermos) Method sample equal (2.349) eV.