ridm@nrct.go.th   ระบบคลังข้อมูลงานวิจัยไทย   รายการโปรดที่คุณเลือกไว้

Under-coordinated atoms induced local strain, quantum trap depression and valence charge polarization at W stepped surfaces

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Under-coordinated atoms induced local strain, quantum trap depression and valence charge polarization at W stepped surfaces
นักวิจัย : Wang, Yan , Zhang, Xi , Nie, Yanguang , Sun, Changqing
คำค้น : DRNTU::Engineering::Electrical and electronic engineering.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2554
อ้างอิง : Wang, Y., Zhang, X., Nie, Y., & Sun, C. (2011). Under-coordinated atoms induced local strain, quantum trap depression and valence charge polarization at W stepped surfaces. Physica B : condensed matter, 407(1), 49-53. , 0921-4526 , http://hdl.handle.net/10220/17734 , http://dx.doi.org/10.1016/j.physb.2011.09.117
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physica B : condensed matter
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

We have explored the effects of atoms under-coordination on surface structure relaxation, binding energy shift of W stepped surfaces and valence charge polarization by the method of incorporating bond order-length-strength (BOLS) correlation mechanism into high-resolution X-ray photoluminescence spectra (XPS) measurements as well as density functional theory (DFT) calculations. Results show that the 4f7/2 energy levels of bulk, surface skin and step edge W atoms shift deeper from 2.17 to 2.69 eV with respect to that of the isolated W (28.91±0.01 eV) atoms, while the valence charge energy shift upper from inner to outer layer and from bulk to stepped edge. The surface bond contraction occurs around under-coordinated atoms after geometry relaxation calculation. Consistency among BOLS calculations, DFT calculation and experimental measurements clarifies that the surface bond contraction and consolidation due to the effects of under-coordination atoms induce potential trap depression, which provides perturbation to the Hamiltonian and hence contributes to the surface core level shift deeper, and that the surface valence charge are polarized by the densely trapped core-level electrons to upper energy.

บรรณานุกรม :
Wang, Yan , Zhang, Xi , Nie, Yanguang , Sun, Changqing . (2554). Under-coordinated atoms induced local strain, quantum trap depression and valence charge polarization at W stepped surfaces.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Wang, Yan , Zhang, Xi , Nie, Yanguang , Sun, Changqing . 2554. "Under-coordinated atoms induced local strain, quantum trap depression and valence charge polarization at W stepped surfaces".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Wang, Yan , Zhang, Xi , Nie, Yanguang , Sun, Changqing . "Under-coordinated atoms induced local strain, quantum trap depression and valence charge polarization at W stepped surfaces."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2554. Print.
Wang, Yan , Zhang, Xi , Nie, Yanguang , Sun, Changqing . Under-coordinated atoms induced local strain, quantum trap depression and valence charge polarization at W stepped surfaces. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2554.