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Efek Mekanika kuantum pada proses fotosintesis

Dimulai oleh reborn, April 14, 2007, 10:13:45 PM

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reborn

Fotosintesis adalah suatu proses yang merubah energi cahaya (matahari) menjadi energi kimia dalam bentuk pengikatan karbon. Proses ini melibatkan rantaian reaksi molekuler dan dibantu oleh klorofil. Konversi energi ini sangat efisien, mendekati 100%, dan berlangsung relatif singkat. Bagaimana hal ini bisa terjadi masih merupakan tanda tanya. Tapi baru2 ini  studi dari Lawrence Berkeley National Laboratory menyarankan bahwa efek mekanika kuantumlah yang berperan dalah proses fotosintesis.

[pranala luar disembunyikan, sila masuk atau daftar.]

Kutip“We have obtained the first direct evidence that remarkably long-lived wavelike electronic quantum coherence plays an important part in energy transfer processes during photosynthesis,” said Graham Fleming, the principal investigator for the study. “This wavelike characteristic can explain the extreme efficiency of the energy transfer because it enables the system to simultaneously sample all the potential energy pathways and choose the most efficient one.”

The photosynthetic technique for transferring energy from one molecular system to another should make any short-list of Mother Nature’s spectacular accomplishments. If we can learn enough to emulate this process, we might be able to create artificial versions of photosynthesis that would help us effectively tap into the sun as a clean, efficient, sustainable and carbon-neutral source of energy.

Towards this end, Fleming and his research group have developed a technique called two-dimensional electronic spectroscopy that enables them to follow the flow of light-induced excitation energy through molecular complexes with femtosecond temporal resolution. The technique involves sequentially flashing a sample with femtosecond pulses of light from three laser beams. A fourth beam is used as a local oscillator to amplify and detect the resulting spectroscopic signals as the excitation energy from the laser lights is transferred from one molecule to the next. (The excitation energy changes the way each molecule absorbs and emits light.)

Selanjutnya baca di link di atas ya  ;D