Instability of some divalent rare earth ions and photochromic effect

application and construction of carbon paste modified electrodes developed for determination of metal ions in some real samples

ساخت الکترودهاِی اصلاح شده ِیکِی از چالشهاِی همِیشگِی در دانش شیمِی بوِیژه شیمِی تجزیه مِی باشد ،که با در نظر گرفتن سادگِی ساخت، کاربردی بودن و ارزان بودن روش مِی توان به باارزش بودن چنِین سنسورهاِی پِی برد.آنچه که در ادامه آورده شده به ساخت و کاربرد الکترودهاِی اصلاح شده با استفاده از نانو ذرات در اندازه گِیرِی ولتامترِی آهن وکادمِیم اشاره دارد. کار اول اختصاص دارد به ساخت الکترود خمِیر کربن اصلاح شده با لِیگاند داِ...

Interactions between rare-earth ions and DNA of Bashibai sheep.

The interaction between rare-earth ions and DNA from Bashibai sheep was studied by microcalorimetry and electrochemistry. The DNA chain was found to have four to five binding sites for rare-earth ions. The binding affinity was about 10⁻⁵-10⁻⁶ M. It was also found that smaller ions caused more heat to be released in the process of binding and bound more readily to the nucleic acid chain. This is...

Spectroscopic properties of Fe3+ in GGG and the effect of co-doping with rare-earth ions

The spectroscopic properties of Fe3+ in tetrahedral d-sites of GGG and the effect of co-doping with ~ m 3 + are investigated. It is thus shown that a very efficient energy transfer from ~ e 3 + (d) to ~ m ~ + takes place due to a good superposition of Fe emission and Tm 3 ~ 6 > 3 ~ 4 absorption spectra and due to a favorable packing of the d-sites around the dodecahedral site occupied by Tm. It...

Nephelauxetic effect of low phonon antimony oxide glass in absorption and photoluminescence of rare-earth ions.

An antimony oxide based monolithic glass with very high Sb2O3 content (70 mol%) in the system K2O-B2O3-Sb2O3 (KBS) has been prepared for the first time. Its phonon energy (602 cm(-1)), evaluated by infrared reflection spectroscopy, is found to be very close to that of fluoride glasses (500-600 cm(-1)). After doping with different rare-earth ions, their UV-vis absorption and photoluminescence pr...

Proposal for laser-cooling of rare-earth ions