Electronic Resource
Gallium Arsenide Clusters and their Interfacial Physics and Chemistry
| العنوان: | Gallium Arsenide Clusters and their Interfacial Physics and Chemistry |
|---|---|
| المؤلفون: | RICE UNIV HOUSTON TX DEPT OF ELECTRICAL AND COMPUTER ENGINEERING, Smalley, Richard E., Curl, Robert F., Tittel, Frank K. |
| المصدر: | DTIC AND NTIS |
| بيانات النشر: | 1992-01-15 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | Gallium arsenide clusters have been studied on a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer with an external supersonic cluster source. Reaction of GaAs cluster cations with ammonia revealed that all cluster cations larger than seven atoms were most reactive near the 1/1 composition ratio of gallium/arsenic. The results suggest that even at this small size, the clusters begin to adopt the alternating gallium/arsenic bonding arrangement characteristic of bulk GaAs crystal surfaces where gallium-arsenic bonding activates gallium atoms for ammonia chemisorption. With excess NH3, GaAsy (NH3 )z( +) with the same GaAs composition (x and y) was observed with several values of z, which is explained in terms of the existence of multiple isomers of GaAs clusters. However, the anions were found to be inert toward NH3. Nitric oxide was found to etch singly charged GaxAsy (x + y = 9 to 16) clusters. A pronounced even-odd alternation in cluster ion reactivity towards NO was observed with the odd numbered cluster ions which are believed to be closed shell singlets being much less reactive than the even numbered cluster ions which are of necessity open shell species. The local density calculations of small GaxAsy (x + y < 10) have been carried out. Multiple low energy structures were found, and the electronic properties are in agreement with experimental results. |
| مصطلحات الفهرس: | Inorganic Chemistry, Physical Chemistry, GALLIUM ARSENIDES, CLUSTERING, STRUCTURES, DENSITY, MASS, ENERGY, REACTIVITIES, CRYSTALS, ATOMS, AMMONIA, SURFACES, ISOMERS, LOW ENERGY, BONDING, MASS SPECTROMETERS, NITROGEN OXIDES, ANIONS, SPECTROMETERS, CHEMISORPTION, CATIONS, CYCLOTRON RESONANCE, ELECTRONICS, IONS, FTICR(FOURIER TRANSFORM ION CYCLOTRON RESONANCE), ION CYCLOTRON RESONANCE, Text |
| URL: | |
| الاتاحة: | Open access content. Open access content Approved for public release; distribution is unlimited. |
| ملاحظة: | text/html English |
| Other Numbers: | DTICE ADA249565 832025617 |
| المصدر المساهم: | From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.ocn832025617 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |