Studi Model Rekombinasi Dalam Pembangkitan Plasma Laser Bertekanan Rendah

Trilaksana, Herri (2005) Studi Model Rekombinasi Dalam Pembangkitan Plasma Laser Bertekanan Rendah. Masters thesis, Institut Teknologi Sepuluh November.

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Abstract

elah dilakukan eksperimen mengenai dinamika pembangkitan plasma bertekanan rendah oleh laser Nd:YAG Q-switched pada panjang gelombang fundamental 1064 nm dan lebar pulsa 8 ns dalam kondisi udara bertekanan rendah (5 torr) menggunakan sampel logam tembaga (Cu). Untuk menjelaskan mekanisme eksitasi garis emisi sensitif Cu I pada 521,8 nm, 515,3 nm, 510,5 nm, 324,7 nm, dan 327,4 nm, elektroda mesh nikel dengan transmisi 60% diletakkan 5 mm di depan permukaan sampel tembaga (Cu). Elektroda tersebut diberi beda potensial DC tinggi dalam rentang 100–400 volt untuk menangkap elektron-elektron yang terlepas dari permukaan sampel logam tembaga (Cu). Dengan mengamati intensitas garis-garis emisi Cu I pada 521,8 nm, 515,3 nm, 510,5 nm, 324,7 nm, dan 327,4 nm pada daerah setelah elektroda mesh menggunakan Optical Multichannel Analyzer, mekanisme pembentukan plasma sekunder pada plasma laser bertekanan rendah dapat dijelaskan melalui proses rekombinasi ion-elektron. Temperatur plasma pada tekanan udara 5 torr berada pada rentang 6000–7700 K. Proses rekombinasi terjadi pada daerah sebelum elektroda mesh, dan penerapan tegangan pada elektroda mesh ternyata tidak mengurangi intensitas garis emisi Cu secara signifikan.
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An experimental study was conducted on the dynamics of low-pressure plasma generation using a Q-switched Nd:YAG laser operating at its fundamental wavelength of 1064 nm with a pulse width of 8 ns under low-pressure air conditions (5 torr), using a copper sample. To investigate the excitation mechanism of the sensitive Cu I emission lines at 521.8 nm, 515.3 nm, 510.5 nm, 324.7 nm, and 327.4 nm, a 60% transmission nickel mesh electrode was placed 5 mm in front of the copper sample surface. The mesh electrode was subjected to a high DC voltage in the range of 100–400 V to capture electrons ejected from the copper sample surface. By observing the emission intensities of the Cu I lines at 521.8 nm, 515.3 nm, 510.5 nm, 324.7 nm, and 327.4 nm in the region beyond the mesh electrode using an Optical Multichannel Analyzer, the mechanism of secondary plasma generation in low-pressure laser-induced plasma can be explained by an ion-electron recombination process. At an air pressure of 5 torr, the plasma temperature ranges from approximately 6000 to 7700 K. The recombination process occurs in the region before the mesh electrode, and applying a voltage of 100–400 V to the mesh electrode does not significantly reduce the emission intensities of the Cu lines.

Item Type:	Thesis (Masters)
Additional Information:	RTFi 621.366 Tri s
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Mathematics and Science > Physics > 45101-(S2) Master Thesis
Depositing User:	magang .
Date Deposited:	30 Sep 2026 02:30
Last Modified:	30 Sep 2026 02:30
URI:	http://repository.its.ac.id/id/eprint/145062

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