Sublimation of graphite in continuous and pulsed arc discharges

Afshan ASHRAF; Kashif YAQUB; Sumera JAVEED; Sumaira ZEESHAN

Makale detayları

Sublimation of graphite in continuous and pulsed arc discharges

Yazarlar:

Afshan ASHRAF | Kashif YAQUB | Sumera JAVEED | Sumaira ZEESHAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2010 Vol.34 Issue 1, pp.33-42

Belge Tipi:

Makale

Yayın Tarihi:

12/2009

Belge Dili:

Türkçe

Document ID (Org No.):

2000760704

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Özet:

 

Sublimation of graphite has been investigated in continuous  and pulsed arc discharges.  The results of continuous arc discharge  between graphite electrodes are compared with pulsed arc discharge  between cylindrical Aluminum cathode and annular graphite anode.  The  sublimed species include monoatomic and diatomic carbon clusters with  their relative composition depending upon the mechanism of energy  dissipation in graphite electrodes.  Diatomic carbon (C2) is the  dominant subliming cluster.  Emission spectroscopy of the Swan band  system [d3\prod g -a3\prod u ] of C2 has been used to investigate  the thermodynamic state and to deduce the vibrational temperature  (Tvib).  The vibrational level densities indicate that local  thermodynamic equilibrium exists in both types of discharges and  Tvib \approx 7000-9000 K.

 

Sublimation of graphite has been investigated in continuous  and pulsed arc discharges.  The results of continuous arc discharge  between graphite electrodes are compared with pulsed arc discharge  between cylindrical Aluminum cathode and annular graphite anode.  The  sublimed species include monoatomic and diatomic carbon clusters with  their relative composition depending upon the mechanism of energy  dissipation in graphite electrodes.  Diatomic carbon (C2) is the  dominant subliming cluster.  Emission spectroscopy of the Swan band  system [d3\prod g -a3\prod u ] of C2 has been used to investigate  the thermodynamic state and to deduce the vibrational temperature  (Tvib).  The vibrational level densities indicate that local  thermodynamic equilibrium exists in both types of discharges and  Tvib \approx 7000-9000 K.

Makale detayları

Sublimation of graphite in continuous and pulsed arc discharges

Yazarlar:

Afshan ASHRAF | Kashif YAQUB | Sumera JAVEED | Sumaira ZEESHAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2010 Vol.34 Issue 1, pp.33-42

Belge Tipi:

Makale

Yayın Tarihi:

12/2009

Belge Dili:

Türkçe

Document ID (Org No.):

2000760704

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Graphite sublimation

continuous arc discharge

pulsed arc discharge

electron collision

Sayı

Makale detayları

Sublimation of graphite in continuous and pulsed arc discharges

Yazarlar: Afshan ASHRAF | Kashif YAQUB | Sumera JAVEED | Sumaira ZEESHAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2010 Vol.34 Issue 1, pp.33-42

Belge Tipi: Makale

Yayın Tarihi: 12/2009

Belge Dili: Türkçe

Document ID (Org No.): 2000760704

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Graphite sublimation

continuous arc discharge

pulsed arc discharge

electron collision

Sayı

Yazarlar:

Afshan ASHRAF | Kashif YAQUB | Sumera JAVEED | Sumaira ZEESHAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2010 Vol.34 Issue 1, pp.33-42

Belge Tipi:

Makale

Yayın Tarihi:

12/2009

Belge Dili:

Türkçe

Document ID (Org No.):

2000760704

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101