"Ils se souviendront de cette expérience."

Translation: They will remember this experience.

[PegWhitman]

I had cette experience but changed it to cet experience thinking you could not have two vowels together. What am I missing here?

[Jojo553168]

You can't have two vowel sounds together. And as you don't normally pronounce the last -e in cette, it already sounds like cet. That's why you can use cette for feminine nouns starting with a vowel.

[Calafia77]

Why is de necessary?

[Escarjoe]

"They will remember this experiment." Shouldn't that work too? Admittedly, not as common a phrase.