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2Â¥2008-11-12 19:33:59
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Originally posted by ÐéÇ« at 2008-11-12 19:33:
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4Â¥2008-11-13 10:06:19
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lb1586551

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If you want to find out the right transition state, you are of only necessity to change the initial guess. The other methods are only secondary.
5Â¥2008-11-13 15:03:24
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ÒýÓûØÌû:
Originally posted by lb1586551 at 2008-11-13 15:03:
If you want to find out the right transition state, you are of only necessity to change the initial guess. The other methods are only secondary.

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6Â¥2008-11-17 16:00:38
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lb1586551

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spur(½ð±Ò+2,VIP+0):^_^ Many thanks£¡£¡Welcome to emuch!
I have to admit that there are several reasons that can lead to the difficulties of calculated transition state. First, due to the b3lyp/6-311++G(d.p), it is likely that you can not seek for the transition state for the specific reaction. I suggest that you may use other methods such as MP2, BHandHLYP and so on. Second, What is worse, it is of great possibility that there is no transition state existed.
7Â¥2008-11-17 17:00:08
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Ìú³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
Originally posted by lb1586551 at 2008-11-17 17:00:
I have to admit that there are several reasons that can lead to the difficulties of calculated transition state. First, due to the b3lyp/6-311++G(d.p), it is likely that you can not seek for the tr ...

thank you very much !
1.i am trying to find the TS of such a reaction : H abstraction .
  CH4 +O2=CH3+HO2
and it is proved that a transtion state exists and somebody found it with b3lyp .
2.i am a rookie now .but i tried TS and qst2 .but it always ended with the errors i mentioned above .
3.i tried changing or adding key words ,and chang ing the initial geom,but it did not work either .this makes me very frustrated and a little anxious .
so ,i am here to ask all you for help !
thank you all !

[ Last edited by ÓÑ·ç on 2008-11-17 at 19:41 ]
8Â¥2008-11-17 19:29:05
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hanjunfeng

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lei0736(½ð±Ò+1,VIP+0):лл
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OK
9Â¥2008-11-24 09:43:29
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gaochao85

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lei0736(½ð±Ò+2,VIP+0):лл »¶Ó­¹âÁÙ
I think you should build the reactnat complex firstly. second, "opt" the complex.
and then use QST2
10Â¥2008-11-24 11:33:29
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