Mahabad Ibrahim

Mahabad Ibrahim
Salahaddin University-Erbil | SUH · Department of Arabic

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12
Publications
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110
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Publications

Publications (12)
Article
Full-text available
Cognitive structures embody mental concepts and direct our thinking about the world. In addition, semantic approaches reveal the conceptual structures involved in organizing the meaning of a word in light of the frames by which the meanings of words are understood. To understand the most prominent cognitive theories and semantic concepts, one must...
Article
Full-text available
31 ‫ل‬ 9 ‫ل‬ 2222 ‫القبول‬ ‫تاريخ‬ 37 ‫ل‬ 32 ‫ل‬ 2222 ‫المفتاحية:‬ ‫الكلمات‬ ‫االختلف،‬ ‫مبدأ‬ ‫التضمين،‬ ‫التداولي،‬ ‫التفاعل‬ ‫التأويل.‬ ‫ار،‬ ‫الحو‬ Keywords: deliberative interaction, implication, the principle of difference, dialogue, interpretation. ‫الملخص‬ ‫المساء‬ ‫و‬ ‫الصباح‬ ‫حديث‬ ‫اية‬ ‫رو‬ ‫في‬ ‫التداولي‬ ‫التفاعل‬ ‫(قانونية‬ ‫ـ‬ ‫ـ‬...
Article
We have studied (alpha) -sexithiophene ((alpha) -6T) films by photoinduced absorption (PA) and optically-detected magnetic resonance (ODMR). The PA of the disordered film is composed of two polaron PA bands and one bipolaron PA band, each with its own vibronic side bands. Measurements of an ordered film indicate that charge conjugation symmetry is...
Article
We have studied (alpha) -sexithiophene ((alpha) -6T) films by photoinduced absorption (PA) and optically-detected magnetic resonance (ODMR). The PA of the disordered film is composed of two polaron PA bands and one bipolaron PA band, each with its own vibronic side bands. Measurements of an ordered film indicate that charge conjugation symmetry is...
Article
Using photoinduced absorption and its version of optically detected magnetic resonance, we observe a vibronically split triplet-triplet absorption band in sexithiophene films. The observed vibration frequency is then used to determine the triplet manifold electronic susceptibility and the ground triplet manifold level 13Bu
Article
We have studied the absorption spectra of charged excitations in sexithiophene thin films induced by doping and photogeneration. Absorption bands at 0.80 and 1.54 eV are attributed to spin-12 polarons, whereas a single absorption band at 1.1 eV is due to spinless bipolarons. Charge conjugation symmetry breaking is evident for both polarons and bipo...
Article
We present photoexcitation studies of vacuum-deposited neutral films of sexithiophene (6T) using photoinduced absorption spectroscopy and photoinduced absorption detected magnetic resonance (PADMR) techniques. We find evidence for photoinduced polarons (photoexcited ‘radical ions’) having spin 1/2, with two absorption bands at 0.80 and 1.54 eV, res...
Article
We present photoexcitation studies of vacuum deposited neutral films of α,ω-substituted sexithiophene (α-6T) using photoinduced absorption (PA) and PA-detected magnetic resonance spectroscopy (PADMR). We find evidence for photoinduced polarons having spin 1/2, with two absorption bands at 0.80 and 1.54 eV, respectively, and with negative PADMR sign...
Article
We have studied films of neutral 6T using photoinduced absorption spectroscopy. Two pairs of strong and weak narrow absorption lines are observed at 0.80 (strong), 0.96 (weak) and 1.54 (s), 1.68 (w) eV, respectively. They are very similar in energy, width and shape to those found in the radical cation 6T . We therefore assign them to long lived pho...
Conference Paper
We present studies of neutral films of sexithiophene (6T) using the photoinduced absorption spectroscopy technique. We find two strong absorption bands very similar in energy (0.80 and 1.54 eV) and shape (both feature shoulders) to those found for the radical cation 6T(0+), In addition, there is a weak band (at 1.1 eV) similar in energy to that of...

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